I have tried taking methyl cobalamin for the past 4 days and I feel awful. Depressed ,sleepy & can't function. The funny thing is the tingling in my hands and feet have improved somewhat & I can walk upstairs easier. I can't continue with these though as they make me feel I'll. I will go back to my hydroxo until my next injection on 26th. I can't wait ! Has anyone else had this problem ?