Sleep training?

Question

Okay so baby girl was doing great giving us 10-11 hours a night sleeping by herself (still in our room) and then all of a sudden a couple months ago will NOT sleep by herself and we’ve had to cosleep now.  She is absolutely inconsolable (she cries until she vomits) when we put her down. We’ve tried everything, white noise, my clothes by her, shushing and putting our hands on her, etc etc. 
I’m terrified of giving her any trauma or putting any damper on her (future and current) mental health as I have battled MDD and GAD my entire life. But I truly am willing to try anything as not sleeping is putting my mental health at more risk. 
Anyone have any other advice on how to get her to sleep by herself again?

Answer

My now 4 year old was like that...didn't want to sleep alone, cried until she threw up. We ended up taking off one side of her crib and pushing it up against our bed so she was there but not really in our bed and waited to move her until she got a bit older. It wasn't a perfect solution but worked for us.

Answer

I've heard good things about the 'Precious Little Sleep' book, maybe it's worth a shot?
We got our first to sleep independently by having Dad put him down instead of Mom. He was a bit miffed because he didn't get to fall asleep on a boob, but he learned to self-soothe without being left to cry alone.

Answer

How old is she? Is she just sleep regressing? It may be a phase?

Sleep training?

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