I'm sorry you are having these health problems. I'm sure you little fur baby helps to cheer you up despite what you are going through.
When Gracie was young she could not tolerate treats either. Of course now we find that many of the treats available in stores are not good for them anyway.
There are some all natural American made treats that are simply dried meat (not to be confused with the jerky treats) available. You won't find them in most stores but if you look online there are several all natural dog food vendors that sell them. Gracie does get treats now but they are one ingredient treats so I don't have to be concerned about multiple ingredients that may give her problems.
Here is a link that is an example of what I am talking about
:
Amazon.com: Whole Life Pet Products Pure Meat All...
Hope you and your fur baby are both feeling better soon.