I began taking Toprol as I left the hospital after a mild heart a...

I began taking Toprol as I left the hospital after a mild heart attack in March ('06). 100 mg at first, then 150. I kept expecting my sex drive to come back as I recovered from the HA, but it never has. Viagra gives me an erection but the problem is, I don't care. Sex has no meaning, I don't care about it. I am tired most of the time and even when well rested, 3 hrs is as long as I can do anything. I never have an appetite anymore. How do they expect me to function?