Atenolol and paxil

I am trying to wean off of Atenolol bc it makes me tired and I feel as though my metabolism has slowed down. I have been on it for one year due to a fast heart beat. I did not have hbp when prescribed and I don't now. I was suffering from anxiety due to katrina and quit smoking. sometimes I feel sick to my stomach. has anyone gotten sick to their stomach from this med. also, I found that if I take it at night I am not tired during the day but I do have strange dreams.
my real question is how can I wean myself off this drug. I am afraid that if I stop it I will be somewhere and my heart will jump out of my chest.

I was taking Atenolol for about three years and suffered from dizziness, anxiety attacks, depression, wheezing and shortness of breath, muscular aches and pains, but some of those symptoms may have been caused by other medication I was, and still am, taking.
I stopped taking atenolol but also stopped taking the cholestrol-lowering tablets just before that and got them replaced by the doctor.
The aches and pains stopped and the depression almost gone, but still experimenting.
Trouble with doctors is they always give you and treat you with tablets that will have no come-back on them - just in case, so we never know where we stand. I had thought of suggesting taking niacin and asking the doctor`s advice but I know what he`d say and advise me not to take them to clear himself; point is, my cholestrol dropped from 7.8 to 3.6!!