Hi Kelsie Lou,
I am 6 months out from a LTKR. I have Crohns Disease, Fibromyalgia, and too suffer with chronic pain. I was on pain meds already before my tkr, so between already being on opiod pain meds, and suffering with chronic pain, my pain was worse than most, and I suspect you are probably experiencing things much the same as I did.
Our pain is a bit harder to control. I had issues finding the right pain med for me, but found that 2 Dilaudid every 3 hours was what worked for me. There was a confusion that happened between me and my OS office, and when I requested a refill it took a week for them to get back to me. So afraid he was not going to refill it I weaned down on the Dilaudid and went to the other med he had given to me for breakthru pain, Percoset with tylenol. Well becuz of my delicate digestive system due to the Crohns Disease, the Percoset w/Tylenol gave me a horrid case of gastritis. So from weeks 2 thru 6 I was stuck in my bed really nauseous and having lots of diarrhea. I couldn't even move during those days without feeling really ill. So as you can imagine I did not do any PT between weeks 2 thru 6.
Yes my range of motion suffered a bit, but now 6 mos out I can bend between 105-110 and my straightening is about 5. Its not perfect, but it is functional. And what I am trying to tell you thru all this, is that you don't have to go all crazy with PT at this early stage. If you can do some mild stretches 2-3 times a day, even that will help. And of course, PT should never be painful. One thing I did that made it a bit easier, was I made sure I took my pain med at least 45 min before my PT session. This helped me not hurt so bad.
I hope this helps a little. And hang in there this is a long recovery and you have to remember that the knee is in control NOT us. Hugs!