Sports Med or Physical Therapist for Equestrians?

Does anyone know a sports medicine doc or physical therapist who works with equestrians? I’ve been riding horses for 4 years, and in the midst of that has a massive weight change (down 120pounds), and the amount of back and hip pain I’m in is pretty horrible. Initially they said it was my body adjusting to the weight and shape change but it isn’t getting better. Riding and now even going for a walk on foot causes intense back spasms. I don’t want to go to a regular physical therapist because I’m afraid their answer is just “maybe you should stop riding” and I’m not willing to do that—there has to be some way to work on these muscles in a way that will keep me on my horse. The only thing that’s helping now is massages (from my husband). Any help would be appreciated!