Have you ever had a tendon injury to compare the pain too?
I had trouble with my ankle, which still sometimes flares up, which I thought was a trapped nerve. I didn't have a clue what a trapped nerve felt like so looked suitably dumb when I went for a scan and it was loose cartilage in my ankle joint which had come away during a tackle I screwed up playing football.
If it really doesn't go away, go to A&E rather than your GP. Despite the wait, there is a chance they will Xray you there and then at A&E. If you go to your GP they will likely just book an apointment for you to get an xray and then call you back to see them about the results which is far longer and more hassle.