Toprol-XL and cancer

I had my thyroid out due to cancer on 1/22/08. then because of having to take a high amt of levoxyl (synthetic thyroid hormone) I was put on metoprolol for the palpitations. I recently had more surgery to take out cancerous lymph nodes in neck and my dose of metoprolol was increased from 25 to 50 mgs. I was only on 50 mgs for about 4 weeks when I developed depression, insomnia, swollen belly, acid reflux, swollen legs and anxiety. My mind started to go off on me and I had convinced myself that the cancer was in my brain and that's why I felt like I was dying. I was told by my doc that this med does not usually cause depression. I went over the facts and realized I felt pretty good until I started taking this drug. Even on the 25 mgs my legs which are really skinny, started to look like lumpy cottage cheese but I figured it was due to the thyroid removal. I didn't take it at all today because I just want to be rid of it. I know I need to wean off but how long do I have to?

please do not take this drug!!!!!!!! 52yo male hard worker very active.3 years ago lost kidney from cancer did ok.on follow up visit the doctor said my blood pressure high 150/90 put me on toprol 50 mg.this was feb 2007 lost 25 lbs leg pains so bad could hardly walk.nite sweats. flushing,in a fog,depressed,so fatiqued had to leave work in aug.they uped my scrip to 100 2weeks ago it got so bad couldnt get out of bed looked up toprol on the web thank god i found this web site made copies took it to my doctor started weaning me off 2 more pills and i think i can go back to work im feeling better already.thank god i work for a good company and have a great wife or i would have lost everything.how can these people sleep at nite