I had the exact same side effects with Celexa, which is very similar to Lexapro. It was horrible, I had panic attacks, adrenaline rushes all thru the night, and terrible stomach upset, so bad I could not get off the couch. I could not eat, sleep, or think. After enduring this for 5 days, I stopped taking it. I had very minor if any withdrawals, just some dizziness, but within 3 days I felt 100% better. I knew this was not the AD for me, and I was not going to suffer thru it any longer. I am now on Zoloft, and doing well. I have had very few side effects on Zoloft, and they were no where near as bad as Celexa. I just won't put myself thru intolerable side effects, it's telling me this AD is not for me.