The side effects of Lexapro are not promising...nausea, insomnia, ejaculation disorder, somnolence, increased sweating, fatigue, decreased libido, and anorgasmia....ummm....and it's really addictive.

The best thing to do is seek professional advice or try Prozac. You can buy Prozac over the counter in Doha (don't ask why), but it takes 5-6 weeks to take effect.
Anything else and you will have to see a doctor!