First, what do you find relaxing? Try meditation, but that is not relaxing for everybody. Give it a shot, tho--a real shot.
Try different things--bike riding, walking (a couple of hours at a time), swimming, or any other physical type activity. Or something like counter cross-stitching, painting, or even painting by numbers, or quilting, or other crafts (jewelry making). Or collecting--well, anything. I used to collect baseball cards and it was relaxing and time consuming--but that can drive some bat-shit crazy; I loved it. Oh yeah, photography--one can all kinds of stuff with that. The key is to figure out what takes time and interest but does not drive you nuts. Good luck in your search.