Hello Linny
I have almost identical awful hip pain to you - except that X-rays have subsequently shown that my hips are OK, and the pain us due to trapping of nerves in my lower spine, running to my hips - that FEELS exactly like hip pain. I found it hard to believe. I am told that this spine collapse and nerve trapping is is due to osteoporosis, brought on as a side effect of taking prednisolone to combat my GCA. Heyho Linny!
So - don't take extra preds because of this, without seeking detailed expert medical analysis/advice - and X-rays. You may otherwise make matters worse.
Good Luck.