Throat croaking

Hi,
Hope someone can help or share similar experiences.  

Everytime I eat or drink, around half hour later, my throat & airway swells up, and my throat starts croaking like a frog, even with my mouth closed.  I'm not burping, it just croaks on it's own.  I had an upper GI test done last month, returned normal.  I was put on Protonix & Prilosec, but after each meal or beverage, I get a croaking sound in my throat, once the swelling starts.  Really strange !

I have an endoscopy appt in the morning, to figure out what it is.  

Has anyone else had throat croaking ??  I have searched the net, and can't find anything on the symptom.  
Thanks,
AJ