And if so, were you able to implement sleep training in any way?? If not, how did you get your LO to sleep through the night?

LMW is almost 20 months old and used to STTN every single night since she started doing it on her own at 8 months. We just took a trip and now she wakes 2-3 times a night crying. It's been a week and now she vomits almost immediately. So while we were trying to wait her cries out before, now it's not really an option anymore.