i second, or third or fourth - the idea of going to the vet. the not eating thing can be any number of medical issues. one of my cats, it was dental in nature. the one i have now, i figured the same thing, and turns out, he has cancer. we're at 5 months after that appt and he's still here, but the clock is ticking loudly on him.

i used to joke that the other one was bulimic, as she'd eat like a pig, then vomit. in hindsight, some of it was furball related, but when it got more frequent, it was actually the start of CRF, which i then treated with her for another 6 yrs until i had to put her down.

good luck, your kitty is quite beautiful!