Good luck with your ER visit. I hope everything checks out okay. A couple of years ago my teenage son suffered a severely sprained ankle- so severe he was casted for two months- and his entire foot turned purplish every time he stood up even after the cast came off. And yes, it would get numb and tingly. I don't remember what the doctor said caused this phenomenon, but anyway he was fine. I would check periodically that I could feel his pedal pulse (pulse atop the foot), and that his injured foot was as warm as the other one. He just had to ice and elevate most of the time, poor kid.
As for home PT, unless for some reason you are absolutely required to cooperate (e.g. worker's comp), why not call the agency and simply terminate it? That's what I did two sessions after my first TKR. My PT was nice enough, I just thought the whole concept was "lame" and I wanted to rest more. Instead I found myself vacuuming and doing other housework in preparation for their arrival only days after surgery- because that's how I was raised. So I "fired" the home PT service and started outpatient PT when I felt ready. For my second TKR I declined home PT altogether and didn't even BEGIN outpatient PT until 6 weeks post op, and I am doing well (extremely well!) at six months post op.
Look, the average person is perfectly capable of performing their own little mobility exercises at home. There are plenty of resources available for that online and right here on Bonesmart. The one thing I will credit PT with was in helping me with my gait, as I had somehow forgotten how to walk properly.