My wife Jackie is just diagnosed with her second round of MAC. The first time she had the usual 3 antibiotics treatment for 18 months and she tolerated the drugs very well. After 2 years the MAC is back. She has been on the same antibiotics for about 3 weeks now. She woke up about 12 days ago with a severe stiff neck and pain. We tried the ussaul hot/cold and no help. Went to an Urgent Care and the dr there said no reaction to drugs, just a stiff neck. She saw her Infrectious Disease specialist a few days later and he concurred. Now she has beentaking muscle relaxers and pain meds in addition to the MAC treatment. Her neck is progressively worse. She is in constant pain and soreness.Nothing seems to help. She has also tried a professinal massage. Today she is at a chiropractor. Anyone else hade or ever heard of this severe neck pain and stiffness as a side effect of the MAC antibiotics? To me it seems the likely culprit.