Laura, have you received the new Copaxone with the smaller needles? I have heard, and it's only hearsay, that they don't leave the big welts because the needles are smaller in diameter. This way the medication goes in much slower, even with the auto-injector.
Personally I think they might have changed the Mannitol in it and the source of it again, but that is definitely just my own opinion.
Whatever you do, it's the right decision for you. Never doubt yourself. Looking back never helps, and no one can look forward into the future. We have just today to think about and that's enough.