Metoprolol Succinate ER and liver

I am on metoprolol succinate er.50mg. Also diivan Hct 160/25mg. I was on divan hct for about 6months or so. It didnt seem to give me any trouble except all of a sudden the Dr. sarted to talk about my liver. This scared me so I was trying to find out if this pill could cause trouble with the liver.
Then I started metoprolol succinate er about a little over a month ago. I stared to notice leg pain in my legs. I could hardly walk, the pain just kept getting worse. On my own I went off of it one day them called the Dr. He said just go off it until my appointment, which was a week away. I could tell my pulse went up some, so I started to go on a half bill to see if that would help. It helped some, but I could tell there was a little pain, but not nearley as bad. I have a real dry mouth and headache. I asked the Dr. if I could go on anything else. He said metoprolol tartrate. I think you take 2 aday. I dont know if this is any better. Let me know if you have answeres for any of these problems? Thanks