i am a guy who is 17 and i am really curious about this situation. Somewhere around late July, i had found out that i have acid reflux. My doctor had prescribed me Prevacid (Lansoprazole) and told be to take tablets called pepcid complete to help my stomach. For the first couple of weeks, i was doing fine and i had seem to be getting better. Even my eating started to get back to what it used to be. Then, out of nowhere i had gotten sick with a congested nose and my throat was kind of itchy. I was told by my doctor to take Sudafed (Pseudoephedrine) to get rid of my nasal congestion and that it wouldn't interfere with the Prevacid. After i had taken it, the next day i started to feel bad. The nasal congestion had went away but, now i have a new problem. Randomly i have been having like a gag reflex and a feeling like i am going to vomit. I can still kinda eat normally but i have to talk in short sentences sometimes. Sometimes to suppress it, i would chew gum or eat a peppermint. It would go away, but not for long. Another thing to add with the gag reflex feeling is that i've been having the need to clear my thoat alot. I want these problems to go away. Please help me out.