I was on copaxone for 4 1/2 months and just could not handle the side effects anymore - baseball size welts and several immediate post injection reactions, plus a high temperature for hours whenever I had the IPIR. The IPIR sounds somewhat similar to what you experience except it lasted for about 20-25 minutes. I would typically experience a terrible taste in my mouth before the injection was even over. There would be a lot of pain plus I felt like an elephant was sitting on my chest and therefore I had trouble breathing. The pain was typically in my back and chest.