First of all, may God bless you and keep you. I had triple bypass, so I know a little of what I preach. The sedation will, in fact, cause nightmares
, alter your taste for food, and other side-effects. Unfortunately, the sedation is necessary to control pain, heart activity, etc. I remember repeatedly dreaming that one of the nurses was riding a bicycle down the hall. When I told him about it one day, he laughed his ass off.
Your fear is understandable; if you ever do have to have surgery again, discuss this with your surgeon and cardio;ogist ahead of time; they might be able to use something different. I'm betting they filled you full of morphine; that stuff will really play with your head, but it's about the best painkiller around.