My right leg is loosing strength.

I had gastritis from last 6 month and was unable to eat properly. I lost 6 kgs and my legs became too skiny after that. I am recovering well, but noticing that my right leg is weaker than my left leg. I will get pins and needles sometime only in my right leg and also when I wake up in morning some part of my right feet finger (last one) become numb. I sometime feel pain behind backside of knee in right leg. All this issue is only with right leg below knee area. I talked to neurologist but they don't find any issue with it and instead asked me to take vitamin b supplement. I was low on vitamjn d3(9) and b12(200) which is now back to d3 (62) and b12 (650) so I don't see a point taking oral supplement. I am eating b12 rich foods and using multivitamin. Do you think it's all normal or should I be concerned since my right leg finger numbness is keep coming back in night and goes away in morning.