It's a really hard battle. One that doesn't feel as though it will ever end. I can't begin to tell you how much of what you said resonated with me. The fact that you mentioned your hip....I have the same problem with mine (I'll save the details for another post).
All I can really tell you right now is that I'm here and I get it. I'm a couple years your junior and am still in the "Can hardly get out and do ****" phase. I lost two jobs and dropped out of school because of this pain in the *** thing called PTSD. It's crippled me in ways I didn't know were possible.
Sometimes, I don't know why I keep fighting. I also look at my fiance and think, "He deserves so much better". At the same time, I couldn't put him through the pain of losing me. So, I've given myself a mission: It might take years or decades, but with my last breath I'm going to work my *** off to be that "so much better" for him and I'm going to be okay, one day.