Sounds like my hip. Mine is okay standing, worse after walking a while or laying down - yow. I finally had an xray whicch looked fine - no arthritis, they said.
I used to take elavil for it, but I'm so dang tired with out that, I had to get off it.
Thing is, the hip can hurt for weeks or months then just be fine.
This has been going on since '03. And like you, nothing seems to help, other than that elavil. I have shocks down the leg with mine sometimes, but I was thinking bursitis too. Wonder if that shows on MRI? Maybe I'll call my doc too...
Hope you get some help on this. I know, it's miserable.