Shit, when I was going through my Glaucoma ordeal, I had almost all these things due to the pills they were giving me.  I'd eat half bites, and then wait 10 seconds, then wait for the involuntary vomiting, swallow, grimace, take anotherr half bite, etc.  It got to the point where eating was so horrid, I pretty much stopped doing it. I dropped so much weight, my doctor actually took me off the pills for fear of my health.  Had to have the eye removed as a result a few months later, but that is so much better than dying. How can anyone have those symptoms and GAIN weight?  Makes no sense at all.