Kathy,
It sounds like you are having some anxiety issues over and above recovering from surgery. I have some experience with that, but unrelated to my surgery. I actually handled the surgery better than I would have guessed. I would talk to your doctor about anxiety.
As far as exercises go, here's some things you can practice. I don't know what you are capable of now, but you can work yourself up slowly. It took me quite awhile to work myself through this list and I still have a lot of trouble with the ones on the bottom.
1. long walks
2. standing on one leg for 10 seconds (then the other leg)
3. standing heel to toe
4. standing with you eyes closed (make sure you are holding on to something or someone is with you so you don't fall)
5. walking while turning your head side to side
6. walking forward heal to toe (sobriety test) *** used to be tough, but now it's a pice of cake
7. walking backward heal to toe *** used to be tough, but now it's a pice of cake
8. standing heal to toe turning your head side to side *** used to be tough for me but now getting easier
9. walking head to toe turning your head side to side *** very difficult for me, but slowly getting better
10. standing on one leg with your eyes closed *** close to impossible, but I last a lot longer than I used to
11. standing heal to toe with your eyes closed *** close to impossible but I last a lot longer than I used to
Visual exercise.
1. Put a 6 inch letter "B" on the wall. Stand about 5 feet from it. Turn your head left and right but try to keep your eyes focused forward on the letter (about 1-2 minutes). Do the same thing up and down.
There are lot of others that are variations on these.
Wherever you are in your progress, you will notice after several weeks that you can do some things better and it will keep you encouraged.
Right now, I am working on the various walking exercises while turning my head and some of the tougher things with my eyes closed. They still give me a lot of trouble. But some of the stuff early on the list is a piece of cake now even though they were a struggle at the start.