Dear veronica,
I cannot tolerate physical therapy either. But it will NOT kill us.
I have only had one therapist group that took my condition into consideration. I am limited from an accident when I was age 17 and I am closing in on 70 now. The damage that happened is not correctable. So I can say with the authority of personal experience, being sedentary won't kill you. But of course, it's not going to be as healthy as being active. And there are still ways to be active and get our blood flowing. Even if we have to do it on our back or in bed.
Still, I am healthy and I can at least walk, but not for exercise. I can only bend at the waist, plus my leg bones are all different lengths, so regular exercise is clumsy and difficult. usually I do stretches on a bed. That's about it for activity. I was very active before the accident.
Anyway I still have a good life, so nevermind what we cannot do. We need to do what we can. If all you can do is lay there and bend your knees and lift your lower legs and arms, do that. Do what you can to stimulate your circulation, and do stretches. Learn to do these things the right way so you don't injure yourself, of course. And it is worth it to pay for a full body massage once in awhile. Just to keep the circulation going and relax tightened muscle
Also, when you are sitting or laying, make sure to keep your body straight. I know pain makes us want to bend over or curl up, but our muscles need the stretching. You can just be sitting and stretch your muscles. Do what you can, hon. You will be amazed at how much better that feels.
Hugs,
I'm a newbie. 
