Hi Michelle,
Well, I guess I should state first that we really don't address crying out here. It is not the preferred method of sleep "training" per se that the founder believed in.
I think what you will find is that returning to consistency will help your situation tremendously.
I personally would stop letting your lo cry. I think that the vomiting thing is a "learned" ooops that happens from their getting so upset, but I am no expert. I just know that I don't believe in this method sleep training.
The message you are giving is a hard one. During the day you are choosing to let your lo cry to try to get to sleep and at night you are choosing to give it comfort of your closeness to get it to sleep.
If it were you, wouldn't you do whatever it takes to get the latter, including vomiting? :wink:
Try Tracy's methods.....go to the sleep boards and read up on what has worked for others. We did pat/shhhhh, Ricardo was too heavy to pick up and down. Even at 2 these methods work. Will take longer, but I really think your lo is confused.
Good luck and like I said, read up on what the other mom's have done...it's a world of help.