Celexa and second time

I was prescribed this drug and have been taking it for 3 days now. I am taking 20mg and the first time I took it I had the worse panic attack in my life. Second time I took the med I had a a lot of anxiety but then that went away. A while later I felt happy. I was in a really good mod a work but I had some chest pain the lasted all day. then when I got home the pain left for a while. Shortly after eating, the anxiety came back bad. I took some Ativan and the didn't do a thing at all. Which I thought was scary because it usually helps in a few minutes. So it really seemed like I was having a heart attack but I just ended up falling asleep. Nothing happened. The next morning I felt good and decided to take it a third time and I had all the same symptoms I had last night and the Ativan made me fall asleep this time.

i started on citilopram 4 weeks ago, and mentally im a changed man, i had depression and panic attacks and now i couldnt be depressed if i tried to which sounds great but its a liitle strange as i sometimes feel i am missing part of my emotional spectrum, like normal people feel down sometimes and i should still be allowed to feel down every now and then but these tablets wont let you.! physicclay tho i have had a few strange side efects, in the first week i felt shaky and detached and had blurred vision and actually felt a little high (which was nice) but by week 2 i fellt fairly normal and now only get the side effects when i forget to take a tablet otherwise i remain on a plateau. I also smoke pot and often became paraniod after smoking, the best thing is now i can smoke pot to my hearts content and get the high but none of the paranoia and that is fantastic. if your a pot smoking paranoid ~I highly recomend taking 20mg citalopram has anyone else ever experienced this???