I Have Daily Anxiety And Take No More Than .05

I have daily anxiety and take no more than .05 mil of zanex per day. It makes me feel drugged when i take it and when it begins to wear off i have racing thoughts that add to my anxiety. I am thinking about switching to ativan because it has a longer half life and i understand it just relaxes you without the drugged feeling of xanex. I realize i need to probably start an ssri in conjunction but fearful of potential side affects from prozac or other drug until i establish a baseline , hopefully with ativan, that my daily anxiety will be under control. also have agoraphobia . I have also heard that ativan helps with racing thoughts. Also what would you consider a theraputic dose of ativan to keep my anxiety in check. I think i am way under medicating as i hate that detached feeing the zanex gives you. I don't drink and run 5 miles per day 5 days a week. Thanks Brad