My answer to your question got posted in the wrong area. I keep occupied so I don't have time to worry. I have had both a stroke and a blood clot in my lung!
I exercise a lot and that seems to help my energy levels. I do try to get in 3 times a week water aerobics and 2 classes of strength training . I take 1 hr nap in the afternoon.
I do worry a little, but also know I can only do the best I can. Hope this helps, Pat!