i remember first time i shot into the quad, i was stupid and shot way to high and on the side (not into the teardrop shape muscle down closer to your knee, i hit a vein, pumped 3cc in and after 3 mins started to uncontrollably cough for 10 mins straight, scared the crap out of me.... lol for next couple days i could barely walk, after a week it was fine. just ride it out man and see if it gets any better