So I have been on Lexapro for a little over a week now and I have the following observations:
The first few days I had headaches all the time. 
Eventually they subsided to a few times per day and then even more so to in the morning and right before I took the med, then down to right before I took the med and then last night, no real headache and no headache this morning.
The first, few days, I noticed I was super sleepy all the time. 
Just like the headaches that decreased. Now its just harder to wake up still and I get sleepy around the time I am supposed to take it.
One thing that a co-worker and i noticed was that I seem sedated. Calmer. She said she has really noticed an effect this med has had on me. I seem slower but more steady. Whereas before that engery was erratic, it is now more steady through-out the day. 
I yawn a lot. 
I peed a lot at first, thats gone back to normal.
I also feel like having a gigglefest today. 
The strange thing is that I have only been on this for a little over a week and I am only on 5mg. My dr said if I end up on this he will switch me to the 5mg pills instead of having me get the 10s and having to cut them. He's sooo nice. LOL. 
I also keep forgetting to eat. I don't know how I do but I forget to eat???? 
SG