Managing Constipation and Frequent Urination: A Comprehensive Approach - Gastroenterology and Hepatology

Constipation and frequent urination issues?

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This issue is a bit complex because I initially consulted a gastroenterologist, so I categorized it under gastroenterology.
Background: Last Tuesday, I visited a gastroenterologist due to constipation issues.
An abdominal X-ray showed no abnormalities, and the doctor believed that at my young age, it was unlikely for me to have any growths.
Therefore, he prescribed medication (Prescription 1 below) for me to take (the doctor asked if I wanted to proceed directly with a colonoscopy or try medication first; I chose to try medication first).
I took the medication as directed, and by the third day (not including the day of the consultation), my constipation seemed to resolve, so I stopped taking the Senna-coated tablets, while continuing the other medications until I finished them (this Tuesday).
Note: After stopping the Senna, I have been having bowel movements every morning upon waking up, and sometimes after lunch, all without straining (resolved within 1-2 minutes).
Although the amount seems small (subjectively), the stool diameter is visually about 2 cm and yellow (not brown).
Compared to when I was using Senna, my stools were more loose, sometimes with a slightly fluffy edge (plant fiber?), or there would be stools that were not loose but varied in thickness.
Starting last Saturday, I began to experience signs of frequent urination (occurring once daily with a persistent urge to urinate within 30 minutes, and after urinating the first time, there was no more urine).
Initially, I ignored it, and after a night's sleep, it seemed to resolve, until this Monday and Tuesday when the frequency of urination increased (after urinating, I still had the urge to go, but could not).
On Tuesday, I started feeling a bit of pressure below my navel (not painful, somewhat difficult to describe, similar to the feeling after holding in urine and then relieving it), so I went to see a urologist.
After routine urinalysis and an abdominal X-ray, no abnormalities were found (ultrasound also showed no issues; the doctor only mentioned that my bladder was relatively small).
The urologist prescribed medication (Prescription 2) for me.
Note: The doctor asked if I was under a lot of stress, and I said no, informing him that my constipation had normalized after last week.
The current issue is that on that day (Tuesday night) after taking Oxbu, the next morning, my bowel movement situation seemed to have disappeared, and my abdomen felt a bit bloated (around the navel).
I am unsure if there is urinary retention (I have been recording the times of urination and water intake, see Table 1), so I stopped taking Oxbu (I only took one pill before stopping), and the frequent urination issue seems to be under control (now urinating approximately every 1-2.5 hours with a fixed water intake, urine volume ranging from 30 ml to 180 ml measured with a 1L measuring cup; even after urinating, I can still hold it despite having some urge).
(From last Saturday to this Tuesday, there have been no occurrences of nocturia or urinary incontinence).
Can constipation and frequent urination be addressed together? If so, should I return to the urologist for a medication change, or go to a general internal medicine clinic to inform the doctor of my condition and request a new prescription? Are these strange symptoms caused by constipation leading to frequent urination (the urologist mentioned that rectal pressure on the bladder could potentially cause frequent urination), or is it due to autonomic nervous system imbalance (sympathetic/parasympathetic)? Oxbu seems to be a medication for treating overactive bladder, but the urologist did not tell me that this was an overactive bladder condition.
(Is it because the doctor could not determine if it was overactive bladder?) Thank you, Vice Dean, for patiently reading this lengthy message.
Prescription 1: Senna-coated tablets Sennapur 12.5 mg/tab (Sennoside A+B) to be taken at bedtime, 1 tablet orally each time, for 7 days.
Biofermin-R Powder 6 mg / 1 g / pack (antibiotics-resistant lactic acid) to be taken three times daily after meals, 1 packet orally each time, for 7 days.
Kascoal 40 mg/tab (Dimethicone) to be taken three times daily after meals, 1 tablet orally each time, for 7 days.
Mopride FC 5 mg/tab (Mosapride Citrate Dihydrate) to be taken three times daily, 1 tablet orally each time, for 7 days.
Prescription 2: Oxbu extended-release tablets Oxbu 5 mg/TAB (Oxybutynin) to be taken twice daily (once in the morning and once in the evening), 1 tablet orally each time, for 7 days.
Table 1: Units in oz; entries without a specified water intake indicate urine volume, with color noted in parentheses (subjective).
The time is for this Wednesday, and the Oxbu medication was taken last night (Tuesday) between 8:30 and 9:00 PM.
06:48 2 oz 07:07 <-4 oz water 08:09 <-2 oz water 09:42 <-2 oz water 09:11 bowel movement (unable to pass) + urination (unknown amount) 09:18 <-2 oz water 09:50 <-2 oz water 10:22 <-2 oz water 10:26 2 oz 11:28 5 oz (light yellow) 13:28 6 oz (light yellow) 15:06 5 oz (light yellow) 15:09 <-2 oz water 16:10 4 oz (light yellow) 16:13 <-2 oz water, walking 16:16 17:14 <-2 oz water 17:40 <-2 oz water 18:20 2 oz (light yellow), walking 18:30 19:14 <-2 oz water 19:49 <-2 oz water 20:00 1 oz (yellow) 20:25 <-2 oz water 21:08 <-2 oz water 21:58 <-2 oz water 23:03 2 oz.
This water intake does not seem sufficient.

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Niming A1D8CE, 20~29 year old female. Ask Date: 2022/08/04