Gagging sensation

For a month now after having food poisoning and throwing up, I have had this constant gag feeling that wont go away. I dont know if it is from my stomach or if it is from my very large tonsils that were irritated. I just want to know what is causing this grose gag sensation that upsets my stomach and makes me feel like I'm going to throw up. HElP!!

[Tonia1]

I am experiencing post nasal drip that then turns into a tighening at the base of my throat ... almost like I am being coked