scared of medications

Desiree
I had my little one at 28w2d and so far he is doing amazing. I've had some pretty severe PPD and my doctor put me on lexapro as well as ambien, and refilled my migraines medication fioricet. He assures me, as well as my son's nurses, all will be safe for my baby via breastmilk, but I am still so paranoid. Anyone else going through this? Also, does anyone know if medication will stay in your milk until you pump, or over time will it slowly dissipate, the same way it does on your bloodstream. Thanks!