What's wrong with my hip? I really need answers, and fast!?

Okay so a while ago I had pain on the top of my iliac crest. It went away after a while and I'm alright. I run cross country and we were doing a track workout today. 4 400 meters. 8 100 meters. and 12 50 meters. The 50 meters were all out sprints. It was either before or after the first one that I got this feeling in my hip. It felt like there was a little air bubble so I tried to pop it and nothing worked. My coach just told me to keep running and it started to hurt really really bad. Before we ran, when we were doing stretches, we did the knee to opposite shoulder stretch and my hip popped really loudly. I usually pop my hip about 3 days a week. It never hurts and sometimes it even pops on it's own. This time it hurt a little but I didn't hurt afterwards or anything. I don't remember if I popped my right hip (the one that's hurting right now) or my left. I can't even stand up straight now. I've tried everything I know to try and pop the bubble. I've moved my leg across my body while laying down, leaned back really far, swung my leg side to side. did regular stretches etc etc. NOTHING works. I have my state meet on saturday and I'm a senior. This will be my last cross country race and I don't want to miss it. Should I call my doctor? I'm basically freaking out because I have no idea what to do and it hurts!