I get hip injections at the Rheumatologist and that does wonders.

https://www.braceability.com/blog/sacroiliac-jo...

I have a bad right hip and the Rheumatologist gives me will either inject behind my hip or in my SI joint. It helps. Hip pain sucks! Feel better!

Tennis ball therapy. In bed, roll onto a tennis ball, all around under the hip, lower back, hold on triggers points, upper thigh side.. it kills but releases so much.

I'm sorry that you see a possible connection now. I keep learning new things too. For your hip you might try a chiropractor. He has really helped my hip and back pain. He has time to explain how it's all connected.
For example I had knee replacement in Nov. once I started therapy I was having really bad pain in my opposite hip. He showed me how all that was coordinated. And that my former surgeon who did my right knee had made my leg significantly shorter to cause a much longer recovery time for my latest knee replacement in Nov.
this caused me a lot of complications with my knee surgery. I didn't jump right back to work but was allowed to keep my job and just not get paid. By the time I got back to work I realized I had been lied too or greatly misinformed as I was on many different procedures. And bc this was a commitee led church, I was asked to step down or be fired.
As you might image this one act with no time to say goodbye to anyone just pack up and go. I'm not sure what they told the kids and workers bc I was dropped like a hot potato. I guess you can tell I'm still hurting about all this.
I had just received my fibromyalgia diagnosis although I had known from my symptoms that I've had it for more like 6 years. It just explained so many things.
I've rambled on here just to say use a chiropractor and he wants me getting a therapeutic massage at least once a month. I don't know how I'm going to pay for them but I need them to maintain 2 yeas of chriropratic improvements.