TOOK A LEXAPRO AND HAVE NOT SLEPT FOR 2 DAYS?

I took a lexapro 10mg 2 days ago and I have not slept in 2 days. I desperately want to fall asleep but I can't because my thoughts are racing so fast. It was so bad that I had I laid in bed for 8 hours half asleep last night. PLEASE HELP ME. I WANT TO SLEEP BUT I CAN'T?!?