Welcome to HCM!
I have gone through your question carefully and from that it look that she is having some neurological problem-
numbness in hands and other body parts, imbalance of head on and off. You have been yo
neurologist but ether is no mentioning of nay
MRI Brain or any investigation on the basis of which she was declared normal.
Had I been treating her, I would get an MRI Brain and an EEG done to rule out anything neurological. once this is found ok , then these symptoms may be raleted to her
anxiety of the approaching marriage.
as you have a major ceremony coming , it il be advisable that you get the above said investigations along with routine blood tests. Atlest if these test are fine, one need not worry about anything serious.
I think you should see a neurologist once again.
Hope the reply helps her in getting well
feel free to ask more questions.