reversal of side effects

I have experienced irritability, anger and other cns side effects that I believe are due to atenolol. I have been off atenolol for four months now. I now seem not so upset about events in my life that happened in the last eight years. I still find I become easily upset or angry but with an awareness that my emotional feelings are irrational and I should not act on them. My pharmacist says that because I have been on atenolol so long that the cns side effects are irreversible. Does any one know where I can find an expert in atenolol cns side effects?.