I'm sorry you're going through this. Try not to worry about it too much. You can only do what you can do.
Yes, I do something called Qi gong. It is a moving meditation. It has been one thing that has helped me recover to this point. I have a counselor to talk to. But they can only do so much.
There is nothing I can do about the worry. My head will do it even if I don't want it to. Nothing can stop that. At this point, when my friend is suffering this badly, my empathy won't allow for much other than worry.