Tongue Pain: The Role of B12 Deficiency and Parasites - Internal Medicine

Tongue pain and issues related to vitamin B12 deficiency and parasitic infections (long text)?

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Hello Doctor, I mainly want to ask about parasites and gastrointestinal issues.
Here are my personal details:
At the age of 12, I contracted pneumonia and took antibiotics for a month without improvement; I only recovered after taking unknown herbal powders.
By 13, my physical strength declined to the point where I couldn't attend school regularly, and I developed irritable bowel syndrome.
My weight began to drop, and I became very thin.
During this time, my family was in serious discord (my father quit his job to invest in the stock market but lost money, leading to arguments that were often directed at me).
I lived in a situation where I was constantly scolded, especially when the stocks were losing money.
Later, I started attributing all my physical discomfort to psychological factors, mainly because when I went to the hospital, my parents would immediately say I just wanted to play doctor, and the physician would listen and prescribe medication without any examination.
At 15, I was in a car accident that caused brachial plexus injury and migraines, and my memory deteriorated (however, due to the aforementioned factors, my parents' interruptions, these issues were only discovered when I was 20, and the examiners were incredulous).
As my condition worsened, by the age of 20, nothing had improved, and my weight remained at 178/51 kg.
At 21, I experienced chest tightness and went to a cardiologist, where I was found to have moderate aortic regurgitation, and I felt mentally on the verge of collapse.
The following year, my weight suddenly dropped to 47 kg, and I developed lipomas on my shoulders, feeling very weak.

I remember it was summer, just as hot as now, and for at least two weeks, I drank a lot of McDonald's beverages, particularly lemon iced tea, which caused my weight to inexplicably return to 55 kg, then drop back to 51 kg.
My weakness subsided, and I stopped worrying about my weight, focusing instead on regular heart check-ups.
However, since then, I have had no energy without sweet drinks.
About two years ago, possibly due to the stress of stock trading, I began experiencing tongue pain (which I personally feel is atrophy).
I went for an oral examination where both the chief physician and the attending physician examined me; one said it was nothing, while the other noted redness but no wounds, and prescribed B vitamins.
The tongue pain became intermittent.
At the same time, I experienced abdominal rumbling, but I didn't pay much attention to it.

Then, I developed inflammation of the lipoma, which required surgical removal.
After taking amoxicillin for two weeks, I started experiencing severe bloating and constipation, even having anal fissures during bowel movements.
At that time, I consulted a doctor who suggested probiotics.
I bought Wakamato, and while taking it, the bloating subsided, and the blood in my stool completely disappeared.
My weight increased from 51 kg to 57 kg.
However, recently, the tongue pain recurred, and after visiting a nearby clinic, the doctor performed a detailed palpation and only prescribed B vitamins.
When I take them, I have no symptoms, but when I don't, the pain returns.
I personally noticed that the painful area on one side has slight atrophy.
Last Friday, I suddenly felt unbearable pain and looked in the mirror; the same atrophy and redness were present.
Unable to tolerate it, I first took Takeda's high-dose EX (mainly B1, B6, B12, without B2).
After taking it, the symptoms subsided, although the atrophy persists, and the pain is not as severe as last Friday.
Today, I experience pain when not eating, with a sensation of heat and pain that occasionally radiates to other areas of the mouth before returning.
Therefore, I mainly want to ask:
1.
If there are parasites in the body, will routine check-up values be abnormal? My past values have been normal.
2.
Can stool tests at teaching hospitals detect parasites? I've heard that stool tests may yield false negatives unless done for seven consecutive days.
3.
Would you recommend that I undergo parasite testing?
4.
If there are pork tapeworms in the body, are there side effects from self-administering deworming medication? I read news about self-treatment causing worms to migrate to the eyeball.
5.
Can tapeworms or similar parasites cause irritable bowel syndrome or B12 deficiency?
6.
Some online remedies, such as pumpkin seeds and lemon, are said to have anti-parasitic effects.
Is this true? Also, if these remedies fail, can it lead to the parasites migrating?
7.
Does B12 deficiency really cause a red or atrophied tongue?
8.
If the aforementioned traumatic experiences and family issues lead to stress causing insufficient gastric acid secretion, could this result in similar problems?
9.
Is it possible that I have been infected with parasites since a young age without realizing it, or could it simply be a dysbiosis of gut flora with similar effects?
I kindly ask for your guidance on these matters.
Thank you.

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Niming, 30~39 year old female. Ask Date: 2021/05/10