How do you do clamshells? I don't think I have the money for the physoitherapist, but maybe the clamshells work without the torture
I am in America, but to my knowledge bursitis is an acknowledged medical diagnosis and you should be able to get the physio on the NHS. On the other hand, I left the UK 40 years ago and my notions of "normal" NHS provision are probably now in the realms of fantasy. The clamshells are a useful strengthening exercise, but unfortunately the "instrument of torture" treatment was the clincher for relieving bursitis.
Clamshell: Lie on your side, with your knees somewhat bent and on top of each other. Your "good" hip on the floor, your "bad" hip on top. Using your hip muscles, slowly raise your leg, hold it for five seconds, then down again. Do this 10 times. Take a break. Make a total of three cycles (10x3, in other words).
Caution: (1) It is much better if someone personally shows you how to do this, even if it is only once. (2) I'm on the other side of the Atlantic, a layman, and have no expert knowledge of these things. I suppose it is not impossible that my suggestions could make your condition worse, not better.
Initially, and depending on how unfit you are (I was very unfit!) the clamshells may be laborious to do. You may even not be able to do a full cycle of 10. But they get much easier over time. So much so, that eventually I added a "Theraband" (a large elastic band) between by knees in order to make the exercise harder.
Suggestion: Google "clamshell exercise." Lots of info, and pictures, and even videos.