What Could Be Causing My Hip Pain Despite Treatment for Hip Flexor Tendinitis?

I went to the doctor and they said I had hip flexor tendinitis. I took a steroids for 6 days and I am now taking a non steroid for 30 days. My hip flexor pain has gone away I think because I used to hardly be able to walk because I was in so much pain. But now I can hardly run without pain. I can’t figure out if it’s still my hip flexor or if it’s a pinched nerve in my hip, maybe my femoral nerve or if it’s my IT band. My pain stems from my right hip which I think is inflamed. Whenever I try to lift my leg while sitting down it feels dead weight almost. A pain shoots from my hip all the way down to the side of my shin.