it takes time, and you will feel VERY tired for a long time, i was asleep most of the time after my surgery but it was 2 1/2 weeks later i went back to work - in the end even though i was feeling fit as a fiddle walking round my own home it was still too early for me to go back to work - when i did i came down with all sorts of infections and virus's my body was just too worn down after everything it went through...
so please take it easy and dont rush yourself - EVEN if you feel much better realise you are probably not 100% healed yet.