I saw the vet for B12 and Cerenia shots yesterday, and that perked me up for awhile, but today I don't feel so well.
In the afternoon, I had a bout of--excuse the details!--liquid diarrhea, then walked out of the litter box and collapsed on my side with a small seizure. I had tremors in my tail and my rear legs crossed and locked up like I couldn't use them.
Dad rushed me to the vet's office. My glucose was elevated so it was not a low blood sugar situation, but most likely dehydration due to the diarrhea I've struggled with for awhile now because I resist taking pills as much as possible. The vet took blood for further analysis and we'll get those results next week.
UPDATE: The bloodwork came back positive for Pancreatitis, a known issue, but nothing more.