Rumatoid arthritis symptoms and conditions

I have a Mitrol Valve Prolapse. It's very pronounced. I've been on all kinds of meds for it since I was 20 years old and I'm now 50. I was on Lopressor last, but it started to not have much of an affect so they put me on Topral XL 50 mg a day. Since being on it I've been very very tired, more so than usual, but I'm stubborn and push myself. Now I've gotten sever joint pain in my neck, fingers, knees, toes etc. It's awful. I was on the internet looking up the symptoms of lupus and MS; that's how badly I feel. I went to my family physican thinking I surely had to have Rumatoid Arthritis, like my Mom and Grandmother. The test came back normal, no sign of that. I've gained 20 pounds and I've been dieting and exercising the best I can with no avail. I went to look up side effects of Toprol and found this site. Can anyone tell me of a better drug to control palpations and irregular heart beats from MVP? I'd really appreciate discussing a new med with my heart dr. and trying it. I need to get off of this stuff.