I was on lexapro (escitalopram) 20 mg for 1yr. Prior to that, 10mg also 1yr. I quit cold turkey 6 days ago and have intense headaches. How much longer? Thanks :)

You're in withdrawal. It's bad for you because you have been on it for so long. It won't hurt you, but I can imagine it's very uncomfortable. If you have some Lexapro (escitalopram) at home, I would restart it for 1 week, then take 1/2 tablet for 2 weeks, then even 1/4 tablet (if you can) for 2 weeks, then stop.