I have injected into the quad twice now. The first time there was some residual pain for 48 hours just manned up and worked thru it. I injected Sat morning and had to pull out because the pain was indescribable. I moved the injected an inch higher and was fine. Within an hour it felt like I had muscle cramp. Its been 48 hours now and I can barely walk. There is a small amount of swelling, no redness but it hurts to put pressure on the leg, stand still for more than 10 seconds and for my first 10-20 steps. I just got some serious pain medication from my father and some anti inflamitories.

Any idea what I hit?
Anyone with previous experience?
At what point should I go to the doctor?