Acid reflux making me vomit? 15w today

Whitney • Expecting baby #1 in September 2015! 💕
Last night I had some acid reflux before bed mixed with post nasal drip since my allergies are so bad (super attractive). I didn't take my Zantac as I usually do because I found it was making me constipated (also super attractive). When I laid down to go to sleep, I suddenly gagged and sat up and started puking 😩 I threw up maybe 10 times in a row but never felt nauseous the whole time! I had only mild nausea for a couple of weeks in my first trimester and never once threw up. Could I have thrown up from the acid in my throat? Anyone else have this problem? I feel so glamorous! 😂