"my 4th week using celexa. i feel great! for the past 2 years i felt so unhappy for no reason, worried about everything, constant anxiety, grumpy and tired. now i feel like a new person. i find myself smiling all the time, full of energy, positive attitude. i did feel very very tired the first two weeks on it, it made my stomach upset a little. that all stopped around the 3rd week, not a big deal. i am truly thankful for celexa it has changed my life! i am sorry i waited so long to say something to my doctor. if you think you need help call your doctor now, don&#039;t wait."