What was the scariest moment that your newborn had or what problem does your newborn have??

As for my newborn, my newborn have acid reflux but is getting some break with Little Remedies and mucus clogged up through his throat and his nose and when he throws up he usually throws up all those mucus and phlegm and looks like he is choking and hard to breathe and arching his back all the way.. he usually scream in pain and screaming to catch some breath and looks like he is choking very very hard and can't catch any breath!

Is anyone going through that situation as I am or did Go through that before, if so please tell me what did you do to help your newborn.