Can never sleep anymore and cry at night

17/18 weeks and all I do at night is lay awake, unable to fall asleep because my mind is racing and then I get really sad and cry. I seriously don't know how much more of this I can take. I had depression before pregnancy and now it feels like it's coming back and I don't want to deal with it. I was on antidepressants but my doctor took me off because I got pregnant