I have been experiencing something odd and I wanted to see if anyone else had a similar experience and a possible idea for what's going on. I have had the whole ebv/chronic fatigue problem for over 3 years that started with mono. At first it was thought to be strep throat so I was on all these antibiotics. Anyway, about 6 months into this, I start getting severe abdominal pains that would seem to move throughout the day. It would start under my right ribcage then move to my back. This extreme pain lasted for a few months and eventually subsided for the most part. Ever since then though there is a slight lingering pain underneath my right ribcage and there is also a pain in the middle of my spine. It hasn't really been a big deal and I was able to ignore it and forget about it. I had several abdominal cat scans that supposedly ruled out a lot of problems. Now, lately I have been taking probiotics (acidophilus). I have noticed that when I take the probiotics, the small pain in the middle of my spine that I was previously able to ignore, seems to become more inflamed. Also, I notice a direct correlation between taking the probiotics and a VERY stiff and achy neck. I took 2 tablets last night and my neck was very achy today. (brain fog was more intense too btw) However, if I stop taking them for a few days the pain and stiffness will go away for the most part. My question: Probiotics are supposed to be only good and not cause any harm. I believe this pain I am feeling is a clue. What it means though I don't know. I have heard that while using probiotics or antifungals there is a yeast die off that makes you feel worse. But I am wondering specifically about this back and neck pain and stiffness. What is going on back there if I could rip my body open and see? Any ideas?