Ask a Neurologist. Get Answers to Your Neurology Questions.
Hi there. Are you in good health otherwise? Are you taking any medications other than the supplements?
This does not sound at all like ALS. Low vitamin D is often a marker for inadequate sun exposure as the skin normally makes vitamin D when exposed to UV rays. Fasciculations and focal paresthesias (e.g. burning) are most commonly related to stress, fatigue, poor sleep, too much caffeine, etc. It is very common in otherwise healthy young persons like yourself. :-)
Hi. I received your request but cannot speak by phone at this time. I would be happy to continue our conversation however by chat. Do you have further questions?
This does not sound like hypervitaminosis D. This is a rare condition, anyway, and would not be expected to result from the usual supplemental doses. You could have your doctor check your levels to be sure, but this is much more likely to be the result of something else. Do you work out?
These types of symptoms are often the result of an unsuspected injury (often with pain starting only the next day or two) or repetitive micro-trauma from some task that one is doing multiple times per day. The nerves and muscle bundles may already be hyper-excitable due to stress, fatigue, health anxiety, etc so it is a "double hit phenomenon."
Atrophy is usually visible or measurable. Your doctor should have checked you for this. Weakness, such as that associated with ALS does not start with burning pain. It is usually associated with fine motor activities such as buttoning one's shirt or writing. Your symptoms do not suggest this at all. And you are too young for this to be a serious consideration as it typically hits in one's 50's, possibly 40's.
You might have a median mononeuropathy. That nerve runs down the biceps region into the wrist and first 3 fingers primarily. It is typically associated with repetitive strain and is benign. Rest is the initial treament, along with anti-inflammatories if tolerated.