Muscle Pain and Fasciculations: Possible Neurological Causes - Neurology

Muscle fasciculations and muscle soreness with weakness?

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Since 2019, I have experienced occasional muscle soreness in my limbs (about once every 3 to 6 months, lasting approximately 1.5 weeks).
My hand strength has decreased, and when I go shopping and lift items weighing 2 to 5 kilograms or carry equally weighted boxes, I experience intense soreness in the muscles on the inner and outer sides of my forearms, along with decreased muscle endurance.
A neurologist suggested that I might have fibromyalgia.
In 2021, the frequency of these episodes increased, and I began to feel soreness in the muscles around my elbow joint.
When I work with a screwdriver or hammer, if I lift my arms above chest level for a minute, I often feel soreness in my forearm muscles and a lack of endurance, with symptoms fluctuating.

In mid-December 2021, after lifting a 25 kg bookshelf from the basement and walking 150 meters back to my fourth-floor apartment, I felt weak for 2 to 3 weeks, with persistent muscle soreness that did not fully resolve.
I often experience continuous muscle soreness and occasional weakness in the muscles near my elbow and forearm, as well as in my calves, especially upon waking or after resting (the soreness feels similar to the muscle fatigue one experiences after doing 30 to 50 push-ups).
The soreness tends to alleviate after some physical activity, but it quickly returns after a period of inactivity, especially if I engage in more exercise or physical activity than usual, leading to increased soreness afterward.

On January 27 of this year, after handling heavier items during the day and cleaning for the New Year, I began to experience muscle fasciculations in my left forearm (3 cm above the inner elbow towards the wrist) before bed, which lasted until the morning of January 28.
During work that morning, I noticed weakness and soreness in my left forearm.
I visited a neurologist that evening, who prescribed Riluzole 0.5 mg (to be taken when symptoms occur).
The next day, while changing a light bulb, I experienced similar muscle fasciculations in my left forearm, which persisted until the afternoon.
Throughout the New Year, I avoided using my left hand.

After resting during the holiday, while the fasciculations are not as continuous as before, they have become more frequent in the previously affected areas of my left forearm and upper arm near the elbow.
Additionally, I have started to notice sporadic fasciculations in other areas of my body (mostly on the left side), including the back of my left shoulder, the outer side of my left upper arm near the elbow, and the left wrist.
Other areas, such as the top of my right head, the back of my left neck, and the inner elbow of my left arm, have also begun to experience intermittent electrical sensations (similar to a sudden shock) over the past week and a half.

In the mornings, if I feel the electrical sensations in the three areas of my left arm, or if my little and ring fingers feel slightly numb, I experience soreness and weakness while brushing my teeth with my left hand and washing my hair with my right hand.
While I can tolerate the soreness or pain, the muscle fasciculations in my left arm are very concerning.
When I start to feel soreness in my left arm, I hesitate to exert force with it, and if I do continue to exert force (regardless of the intensity), the fasciculations become more frequent, and the frequency of fasciculations in other areas increases as well.

Could you please advise what kind of disease or issue this might be? Is it possible that it could be a motor neuron disease or cervical nerve compression? Or could it be related to medication effects? Which specialist should I consult first: neurology, neurosurgery, rheumatology, or return to my family physician?
Family medical history: My brother and aunt have hyperthyroidism, and my brother's condition improved after medication.

Currently, I am taking Diovan 160 mg and Famotidine 20 mg, respectively for about 6 months and 3.5 months.
In the past six months, I have taken Cozaar 50 mg for one month, Livalo 1 mg for about three weeks, Livalo 2 mg twice, and Rivotril 0.5 mg eight times.
A long time ago, I took cholesterol-lowering medication for two weeks but stopped due to muscle soreness, suspecting an adverse reaction to statins.
In August of last year, after receiving a vaccine, I experienced shortness of breath and dizziness while climbing stairs, leading me to see my family physician.
Blood tests revealed high LDL levels, and the doctor prescribed Livalo 1 mg in early September to try.
After three weeks without noticeable side effects, I developed neck and shoulder pain due to reduced cervical curvature.
After physical therapy, the shoulder pain resolved, but I sustained an injury to my left pectoral muscle, which caused pain for a month.
I noticed that taking Livalo increased my pain, so I temporarily stopped it.
In early December, my family physician prescribed Livalo 2 mg due to elevated LDL levels.
Although I did not experience muscle soreness, I felt warmth and discomfort in my right lower abdomen at night, which prevented me from sleeping.
After stopping the medication, I returned to normal.
I tried taking it again in early January, but it caused the same issue, so I completely stopped taking it.

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fish Lin, 30~39 year old female. Ask Date: 2022/02/18