10 months left side arm leg weakness, numb, hard to walk, now it is getting better, numbness almost gone, no dr has answer to why it happen?

See neurologist! You do not say what kind of docs you have seen and what sort of work-up you have had. Have you had a MRI of your brain? Have you seen a neurologist? Please do both, if either have not been done. If you have see a neurologist, and not gotten an answer that is clear to you, please get a second or even a third opinion. Glad this appears to be getting better. Good luck!