Toprol-XL and one minute

I've been on Toprol for about a year or so. I have had severe weight gain also while barely eating much. I had high bp to start and the cardiologist told me to lose weight and I'd be fine. But he gave me Toprol and things went from bad to worse. I too have been living in a fog, just super tired, my bp now has been around 40 and low 50s. I'm totally exhausted doing nothing more than walk thru my house. Work has been a nightmare, I do alot of walking and bending. I have been sweating terribly also. My hair will be wringing wet. My new cardiologist said that all my synptoms could be from the Toprol so he cut me to 1/2 dose for 4 days and 1/4 for the next 4 and then off of it. Within one day, I don't feel exhausted or hard to breathe either. I feel about 80% better in one day. I'm definitely not going to take it again. I wouldn't say I was really depressed but just didn't have any energy to do anything, even work. Come home and drop on the sofa and not get up. I feel like a weight has been lifted and I hope my mind clears up also. Sometimes I can't seem to remember anything from one minute to the next. Physically I feel alot better and can't wait to get off it totally. My low bp was the result of the Toprol I guess.