Hi, I'm having a severe relapse that has lasted a few months. Most things have slowly improved but my stamina has got worse and worse. I have low b12 and so have started taking 1 drop of sublingual hydroxycobalamin which is 5mcg. I know it is a small amount but it has increased my stamina each day. But yesterday I felt awful and today I am worse. I am worried it is having a negative effect, is this possible? Thanks.