I was given celexa to help me with the anxiety from UC. The first day I took a whole tablet & felt like I was in overdrive all day. I was very jittery. So I have been taking 1/4 of a tablet for 3 days & I still get the same effects. I feel like I have problems concentrating on every day things. I can't wait until evening when the effects start to wear off. Has anyone else felt this way? What do you advise?