Had to finally admit I now need help with walking, not everyday but some days now I can barely move while on others I limp like my leg has been badly broken, so now I am the proud owner of a walking stick and a walker.
When does it start to get better?
In your situation I'd be looking at physiotherapy, something I've been undergoing recently.
I had my 1st Covid jab nearly a year ago, and 3 weeks later I woke up with intense pain and stiffness in my left shoulder, and could only move my left arm around in small movements. Eg, I could not raise my arm to shoulder height. It was murder just trying to put on a shirt or coat.This lasted for many weeks, and I had to take paracetamol until July when I came off it, as the pain started to lessen, but still felt fairly uncomfortable. In October I finally started physiotherapy on the NHS. It took months to get that first appointment, but weeks later I now have full range movement back in my left arm and shoulder, and the pain now is only slight, a big improvement from 6 months ago.
The other treatment I'd seriously consider is acupuncture, which isn't on the NHS (AFAIK), but has been used successfully to treat patients with ME, amongst loads of other serious physical complaints.