Smokescreen, Im no doctor but I would believe that what you are experiencing is pain caused by your central nervous system. You naturally produce hgh when you are in rem3 sleep. That can happen up to 7 times a night. (Think of it this way, you are stacking hgh with your natural production). My question for you is why did you decide to take kigtropin before bed instead of recommended times of the day? Also, i would go to a chiropractor and or message therapist. But the last thing I would do is stop taking it and waste your money. You said previously you went down to 1iu and it helped your sides go away. How are you feeling now and have you bumped back up to 2iu or more and or made any changes? Thanks