I agree with Naomi. They did arrive, and I'm sure allowances are made for paramedics running late.
I also believe that limiting your movement cannot be a good thing, and will only result in less mobility...in spite of pain.
Possibly unhelpful, but when my annoying, sometimes painful knee pain got worse and I couldn't get a Drs appointment, in desperation I looked into other ways to reduce the discomfort. Diet cane up as a cause of inflammation/pain in arthritis for some people. After not having any for ages, I'd recently been eating a lot of bread (wheat), which I immediately discontinued. Pain reduced considerably so I'm can just take paracetamol now. Some may knock it...but it worked for me.
I too have stairs...2 flights down to street level, and one in my flat. I HAD to keep moving.
Whatever you do, I hope you do not have to wait for long to get some action. I'd be either shouting or crying down the phone if I'd been waiting as long as you have.