I had a feet injury and then it goes tingling and numb (very very mild) and on same side my hand also has the same symptoms. One day I had pain in my both hands while writing and lifting weights.  Doctor told me check your b12. I had 150 pg/ml b12 in May 2023. I had 5 shots (alternative days) then pain got relieved immediately  and took  supplements for few months till August..then I stopped taking supplements and checked after few days  it was 600 pg/ml..around August. Now it is dropped to 300 again. What should I do ? There is some muscle loss in both hand and leg and little bit foordrop still present ( from starting no good improvement). What should I do ?