I have been on atenolol for about 9 months. I take 1/2 of a 25mg ...

I have been on atenolol for about 9 months. I take 1/2 of a 25mg tablet. I also experience tiredness. At times I have weak moments that last about 20 minutes, then I began to feel better. I have some cramping in my calves at times. I walk each day but have shortness of breath during these walks. I thought that is was just because I have trouble pulling the hills. I also have the cold fingers and toes at times. I do feel a little depression and don't have much creativity as I once did. I read that Atenolol could cause congestive heart failure. I'm thinking of tapering off, any comment?