I hope your cat is getting better. I am also a huge supporter of vet treatment. It could be a variety of things
Could have threw a DVT (blood clot)
Stroke
Seizure disorder
Even could have goten into something poisoness. You would be amazed at the things I have seen cats get into while vet teching.
Please try and have your mom bring him / her for vet TX.
I hope all works out well
Rusty