I Currently Take Carvedilol And Diletazam (sp) And I Read

I currently take carvedilol and diletazam (sp) and I read that these two drugs could have negative interactions. Today, I stood up and suddenly my legs just collapsed. I did not faint, totally aware but no control over legs.
I have three stents and a pace maker (Boston Scientific). I felt much better before pacemaker. Sudden weight gain, depressed slightly, winded after bending over or raising arms above my head. Just had a cath three weeks ago and arteries are ok.