I had something similar to this for a few months on my left hip. In my situation it was created by a right knee injury. I'd put more weight/pressure on the left side to give a break to my right knee. All this to say that at my last PT appointment (for my knee and elbow) I mentionned this to my therapist. She knew exactly what it was. She got me on my back, she did a few checks - like checking my hips alignment and then some "relaxing" exercises and then while keeping me talking, she pulled on that other side and a "crack" was felt and heard. Hubby sitting on a chair near table heard it too. She then applied some "shocks" to that area and since then I have been pain free. So it was something that got somehow misaligned in that hip due to "bad" posture. It's been 2 weeks since visit and the pain that was there for over 3 months....is barely noticeable now. I can climb stairs and do other things easier. But she said it will remain "fragile" for now and should see her again if it comes back. In the meantime, I have to think to bear the weight on both legs (the right knee is almost back to normal).

So it maybe something to have looked at. I thought it would go away on its own, taking Aleve, etc... it did and would not. A simple manipulation and a few exercises were needed to help that hip.

Good luck.