So sorry that you're having a rough recovery.
From reading your posts, your post op after care is... well... not as good as it could be & IMO may be a factor in why you're struggling so much?
At 10 weeks post op, I was still using a cane because it helped me walk properly & helped support / keep the pain under control. I was still on extra strength ibuprophen & tylenol 3.
I was doing physio 3x/day, walking 10 min. after & then icing the area.
It's also when my PT was happy enough with how things were progressing & discharged me with an action plan on slowly getting back to daily activities. The key word "slowly".
My surgeon had told me no work, no physical activities (other than what the PT ordered) for 3 months.
Everyone heals differently. I'm still very stiff & have soft tissue pain in my THR hip 3 years post op. We're guessing lots of scarring. It sucks but compared to the pain I used to be in pre surgery, it was worth it. Mind you, it probably would've been better had I had the surgery earlier. Who knows?
Do you have a good rapport with your surgeon? Are you confident with how he's handled your case? Is he able to answer all your concerns to your satisfaction? Has he even entertained you seeing a PT? Why did he feel that prednisone was the pain relief to help? Did he offer any other suggestions on pain management? What made him come to the conclusion that it was just irritation & inflammation?
There is an answer to the "why"s... Sometimes it's difficult to find it when you don't know which questions to ask.
Chin up, take a deep breath & slow down, things will get better.
If you need a sounding board, feel free to message me. And post on here, this hip community is a great support network. People may not always reply but they do read the posts.