One last possability. I once took a two cc vial of enan, drew it up, changed to a 1 inch by 23 and shot 1cc in my left delt, changed the needle and shot the same in my right. I had a tremendous amount of pain in my left side, the first shot, and no pain in my right side. I think I must have hit a nerve. I did aspirate of course. Remember Karachi? Painful sus, too much BA (I think). I took ten amps (years ago) and put it in a empty sterile multi dose vial. I put a breather needle in it and baked it at 300 degrees for a half hour. This didn't cure the problem with this particular med, but it cut the pain at least in half.