Is It Safe To Take Celexa And Xanax For Anxiety?

Hi there, My anxiety attack was triggered by marijuana (was my first try and my last) back in January 2014. After that day, I had panic attacks numerous times with in the 5 months and I went to ER many times thinking i m having some serious problem and kind of sure that I was dying. Since that specific day, I don t feel my self. I feel different. I ve this confusion that don t go away. blurry vision most of the time. dizziness and lightheadedness most of the time. My doc diagnosed me with anxiety and I m taking Celexa and Xanax as needed basis if I feel the anxiety attack. What still confused me is I m a normal happy guy (NO MEDICAL HISTORY BEFORE) and could t accept the idea that I have anxiety problem. I am not sure if the marijuana can cause anxiety from no where! At this time, I m just more confused about my situation since I lost my job 5 months ago due to this problem and is still debilitating my life. Sorry if I have some grammatical errors since I ve been in the U.S for few years & of course English is my second language. ANY INFORMATION IS VERY HELPFUL TO ME. PLEASE HELP, I M IN A SMALL HELL.