I agree with every word marigrace wrote! As a caregiver, it's even more important that you take the time to care for yourself. You are an incredibly strong person to be dealing with all of this, and my heart goes out to you and your family!
As far as things you are able to do while in his room, have you considered an exercise bike or a treadmill? Something that's fairly easy to do, while still allowing you enough focus directed at your son.
If you can get a tv in his room, and some hand weights, you could work out with videos. You could even get some of those headphones (I call them "old people headphones" because I've only ever seen my grandfather use them, and he's 95) where the sound of the television is directed through the headphones to just you, so your son is not disturbed by the volume.
I wish I had better advice, but this is not something I've ever had to deal with. Your strength and determination is inspiring, and I wish both you and your son the best. Welcome to 3FC!
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