Welcome to NeuroTalk:

The very first thing you need to do is call up your doctor and get the results of your B12 levels (if you had them done that is). Low B12 slowly damages nerves. If you wait too long to discover this it might become permanent.

If not ask for a B12 test and also a Vit D test. Bring your results here, and don't accept "normal", from the doctor. This is because B12 levels are still outdated by labs...and very low levels can be called normal. It has been a decade and still doctors are behind on this. Same with Vit D... get the level itself. Doctors are still dosing with old D2 (ergocalciferol) instead of the active D3.

Also can you tell us more about your history and self?
What were you doing when this started? Were you ill, did you have antibiotics? Which ones? Did you get a vaccine? Did you have a viral illness, stomach flu?

Can you tell us what tests you've had? Thyroid for example?
ANA, Ig immune globulins?
What is your diet like? Hobbies, exposure to chemicals of any kind?

You have to be a detective of sorts, in order to pinpoint your trigger. This can help in deciding if supplements may help you or not.