First of all you are not a worrier! you are just being a good bully parent? I am just confused as to why the vet would think that getting up in the middle of the night, shaking and throwing up etc is normal?? When duke did this he was passing a toy ( it was awful ) but same symptoms.. but you said they xrayed and all is clear? ..thank God!
I am SURE he is ok (meaning healthy heart etc ) but I would want to know why he did this and try to avoid it happening again. I wonder if there is something you could give to help with the gas?? Maybe the rice is too much? Have you tried pumpkin??
Hoping others chime in so we can help you get to the bottom of it.. I am sure it is so scary for the both of you