Possible stroke? Cats do get them, had to put down our Calamity Jane after she went through a pair of strokes. Was recovering nicely from the first one with a treatment the vet recommended, but the second was just too massive.
I did end up just putting it on my credit card ill deal with that later. Just noticed as i was bringing him to the vet he seems to be leaning to the right a lot as well. All ways seems to be falling on that side specifically and his heads all ways tilting a bit to the right.
You can take him to a low cost vet clinic like the humane society/SPCA. They offer lower cost services. Please call your local branch today. Your cat needs help. This can't be put off.
This does sound like a possible stroke or head injury. Could he have gotten hit by a car or exposed to any toxins?
Miss Calamity kind of curled and tended to go to her left after the first stroke.
It also could be vestibular syndrome, which my cat had and the systems are similar, but why he would get it after being outside would just be a coincidence because it is a disease that just comes on spontaneously. The good news is it clears up on its own after 7-14 days. But that is just a guess and shouldn't preclude getting him checked out. Good luck.
So JK, are you saying you put the $1,000 on your credit card to have tests run on him? If so please let us know what you find out.
CareCredit is a great credit program for vet expenses . Check to see if your vet takes this. If not and he needs more tests take him somewhere that does take this credit---It will allow you to cover the many tests that need to be done, with a small amount to pay off each month.