I had the same kind of pain off and on in my left hip. I went to the Doctor over and over for two years until I finally found a Doctor that sent me to a pshyical therepist. It took him two seconds to figure out that my hip bone had rotated forward out of place. I had always worked long hours on my feet and did alot of heavy lefting and bending. The Doctor said it was due to the type of work I was doing but that anyones hips can rotate forward out of place. I suggest you go to a pshyical therepist as soon as possible. I was also put on Glucosamine. It's fantastic. It takes several weeks before the body absorbs all of the dosage but keep taking it. Let me know what you find out. Good Luck ! The lunges you are doing will only make the problem worse in the long run.