I see you over at the PM board alot. I am so sorry you are having so much pain!! The grocery cart incident may have really "rattled your cage" so to speak. I had the severe stabbing pain in my hip-really deep down. The pinching in the butt part-when I had it-was really SI joint. I was given a dose of oral steroids and it cleared that up. I am a back pain/chronic pain person-post fusion and all. I don't think you are crazy and I am so sorry it took so long for the doctors to take you seriously!
Have you had any steroid injections or treatments of any kind? It sounds severly inflamed, but as you know we aren't docs-lol. I hope you can get some help soon. Pain relievers are just that-relievers-not healers. They wear off and here we go again!
Welcome to this board and I hope you stick around! Fantastic people who have been my support for over two years now.