Brain evolution symptoms and conditions

I have been on 50 mg. of Toprol xl for 5 years I find it so hard to breathe. Like I have to make myself breathe or I'll just stop breathing. I can't sleep because my breathing gets worse even with my head elevated. I'm getting terrific migraines, ready to tear my head off. I'm short of breath, can't hardly do anything and I feel I ran ten miles.. I have heart failure and low blood pressure. He's giving me this for now and then palpitations. I think this pill is causing all my troubles including anxiety. HELP!!