Elise has a good point about pancreatitis; definitely worth getting that checked out. Even if that's not it, it really does sound like there's something going on besides the diabetes that should probably get checked sooner rather than later. As a backup plan, do you have access to an after hours/emergency/weekend vet?
I'm in NJ now, but lived in SoCal (Pasadena/Azusa/Van Nuys) for about 10 years while I was in grad school/postdoc. No vet contacts in the area, unfortunately, but maybe someone here will have some ideas!