If you are in pain, cannot get help from your GP, and cannot get onward referral to a physiotherapist/ muscoskeletal clinic, seeing a recommended osteopath ( privately) is very sensible. Ask friends for a recommendation. They are trained, and registered, and may be able to help reduce your pain quite quickly.
I have not had particularly good experiences with nhs muskoskeletal services ( very long waits, very limited treatment- no follow up) so for decades have either regularly visited a chiropractor or osteopath, to keep mobile.
Best to try again to discuss with your GP.