Don't feel guilty, we all do things we regret, especially when it comes to parenting and we are trying to find our feet. You are doing the best you can. No cry sleep solutions is a great book with lots of advice.

If feeding to sleep is contributing to the vomiting, and you think it is best for her to cut it out, then there is nothing wrong with cuddling her to sleep at all.

Don't be too hard on yourself.