Wow. I haven't been around lately, and just read this thread from the beginning. Seschna, you poor thing. All this uncertainty would have driven me 'round the bend quite a while ago.
It is totally amazing your vet did no blood work, IMO. I can hardly believe that...seriously. How can he know what's going on inside with no blood work?
Beyond that, the only nugget of advice I have is to try putting the kibble in a blender...this solves any problem with chunks your pup might have. Then you can wet it or mix it with canned or whatever.
I had a megaesophagus Yorkie, years ago. She was diagnosed at Angel Memorial in Boston, which is a very big deal here in Mass. They did some kind of test which showed the passage of food in motion through her body. Anyway, I kept her going for several years by feeding her, then picking her up (as you would a baby) and patting her back until the food went down. There would be a bulge in her throat until that happened...and then you could hear it move.
She would usually rest with her chin up on something to stretch her throat and help things (like water) go down. How I loved that little girl...
Doesn't sound like your boy has that...but, maybe you could try burping him after meals, as I did with my Josie? Maybe get the air out before everything comes up? Think of it as a bonding experience...
