Baby choking

Okay so my little one has been choking on her throw up for like 4 weeks now, happening like once a week. She has reflux and was prescribed Zantac but that made her throw up so much but she wasn't choking but I stopped giving it to her because of the quantity of throw up. So now she's choking so bad I start crying like nothing is help they told me to add rice cereal but it's still happening. Has any one experienced this? FTM here any help will be great she'll be 4 months Tuesday