Wasn't doing too bad for the last couple of weeks but woke up this morning to a day of feeling bad fatigued, joint pain in knees, wrist and hands with general aches. Seem to have had this for years. Some not to bad days or weeks and then hit by these bouts of fatigue and pain. As previously posted doctors not helpful and I'm beginning to believe that they think I am a hypochondriac! If I start taking B12 what dose do folks suggest?