Prayers to you OP. My wife has turned me into a crazy cat person over the years and these little furballs (as much assholes as they can be) tug on my heart strings.

Wish I could lend some advice...but most of the problems I have experience in is hypo or hyper thyroid disease...what you are describing doesn't really sound like that.

We did have a kitty that would puke a lot and it was due to kidney failure...not sure if that correlates to what you have described...I would say not because your cat is only 11. Our cat who had those problems was much older...17 or so. I cried more than I have since I was a toddler the day we had to put her down.

Some good advice in this thread...a little bad. I do know you sure as hell never want to give a cat dairy products. Never give a cat milk...not good for them.

Last but not least folks, if you care for your animals FEED THEM GRAIN FREE FOOD! Don't buy the cheap shit full of wheat or gluten or whatever cheap filler that stuff has. We buy the majority of our cat food at PetSmart....it's a chain store but pretty sure they have all healthy options. If you are buying food for your animals at Walmart it'll without doubt drop the lifespan of the buddy you love dearly.

Good luck OP...my thoughts and heart are with you, especially being a cat person.