this shit happened to me whenever i was shooting in my glute... i couldnt even sit down. i would suggest shooting in your quad . the first couple times it might get a little sore. but after that its so much better. also i went down to a 1inch syringe. since theres not as much fat in my thigh as in my ass i dont need a longer needle to get to the muscle. like everyone said , warm ur gear up,rub it after the inject for a good minute. and if it still hurts some vicoden & a heating pad always did the trick! lol