I Had Ulcer Surgery' 3 Weeks Ago, And Now I

I had ulcer surgery' 3 weeks ago, and now I feel very weak ? what do I take for that? they tell me that I might be animic; do you think so? I take cumadin for life, because I had Heart surgery 20 years ago, I have a maganical valve, I just don't want to take any thing, I need to talk to a doctor about it, I already went in for some blood work, the results will be in next week. but mean while what do I do?