Re: gas and mylicon drops
It could have been how you administered the drops. You should SLOWLY let it ooze into the mouth along the side of her cheek with her in an upright position. If you shot it into her mouth while she was laying down then it could have made her gag, which can trigger reflux/gaging/spitting/choking.
Trust me, I've accidently done this. I also find that letting her suck my finger immedietly afterwards triggers her to swollow, otherwise it can pool in the back of the throat where she can choke on it and get her spitting up again.