Go to the Kai Greene Thread, he has a 5 part leg series video on youtube. It's not about hip pain, but the glute section is very thorough and explains what you would need to do to feel it.
1) I know you said you do awesome squats but you don't. Your hips hurt, get the i'm perfectness out your mind.
2) Most likely no one person will be able to automatically diagnose you. The popularity of weight training, has made injuries unique to every person. Chiropractors think the whole world is out of adjustment, the whole world is. Doesn't mean your not supposed to be that how unique your body is, certain muscles need to be out of balance to balance out whatever bone length variations you have. One or two adjustments can be helpful, too many are pretty useless and some can be detrimental. Doctors tend to have fall back answers -- bursitis --- tendonitis --- arthritis --- ..... All have one thing in common inflammation.
3) Inflammation is a horrible gremlin, it's like once you get it, you always have to worry about it. There are three main causes for it overuse, poor diet, poor movement( random injury can fall under here). Being that you don't have a specialist you have to find which one applies to you. Tricky thing is you don't want diet to get rid of it alone. It's kind of like a mask. Like taking ibuprofen. You also have to learn which pains to push through and which to hold back. If this lasted this long then your squat and your way of squatting shouldn't be done anymore. Work around it do squats that you can do, Front, wide stance, whatever. If you were high volume lower it, 6-10 every other day 60%. Concentrate focus on the hip muscle though. Learn about heat and cold. It's application can greatly speed healing.
you probably didn't need any of this, the post earlier said something about hip stretches and foam rolling, that and a little time is probably all you need but you asked for more.
One last thing, you can take yoga or one of those girly crosstraining aerobic classes. They retrain your body to move and get blood flow to all parts. You don't have to do them forever but a short cycle of them have helped most athletes at one point.