Hi Anne,
I am on Lexapro 20mg and I've been on it for 1 1/2 months now. I feel pretty good now, my first 2 weeks were a little tough, but my Dr. had switched me from Prozac after 2 weeks straight to the Lexapro. I'm not sure if my side effects were from the Prozac still in my system or if was the Lexapro- or combo of both!! But I did experience headaches for awhile. I stuck it out and the headaches did go away- I would at times take a .5mg Xanax when my head was hurting (especially at night) and that seemed to help loosen the grip on my head! I hardly need to take any xanax which is good cause I think the Lexapro is finally regulated. I am thankful to feel this well- its been a tough few months- hang in there and if after about 3-4 weeks you don't feel well, check with your Dr..good luck:)
Head pressure is a common side effect of Lexapro. I don't know about feeling hyper, wellbutrin is about the most stimulating antidepressant out there, far beyond Lexapro, but it's possible the combination is either too much for you or will just take time to adjust to. Remember, side effects occur before effects.