Ahhh! hey there.
I can give you my scoop on it. I took Lexapro for about 18 months. I did take a break from it and just recently started back again on the 5mg. At the highest I was actually on about 30mg a day.
Lexapro helped a GREAT deal with my anxiety and panic. I hate the feeling of when you first start it. It seems adjusting to it just is awful but I know from past experience these feelings will pass.
As for side effects. I am 34 years old and weigh 131. I did notice some slight weight gain but nothing like the 20+50 lbs you hear of from other medication. I mean like maybe 5 lbs. I found that if I worked out or walked daily, I felt SOOOO much better.
The WORST thing for me, total and complete loss of sex drive. It was not immediate, it actually was about 3/4 months into taking it.
When I got off the Lexapro my sex drive returned (much to my husbands relief) within a few weeks.
However; I am back on it now, low dosage like you...and hope it stays this way!