How I hope someone can answer your question!! I have the same problem as you and am wallowing in self-pity and misery....
I had bursitis of the Greater Trochanter a couple of yours ago and after battling with it for months finally got a jab. My regular GP wouldn't refer me saying I was "too young" to start having cortisone injections (I was 26), then one day I went to see him again and it was a locum who did it there and then.
My new GP (I have moved house) advised I go away and pop Ibuprofen for a few weeks to "see what happens". I would willing pay to get running again...
My only advice would be to ring around private hospitals/sports clinics (BUPA?) and, if at all possible, have the direction done using ultrasound to make sure they nail it first time. Be aware that some people suffer from "steroidal flare" which can be painful.
Best of luck and keep us (ME!) informed if you find somewhere.
gp