fwiw, while i'm thinking of it, there's a few other members here in Cleveland if you find you need some help with the hometesting, etc.....i'll go ahead and send them some pm's (private messages) and just point them here for introductions just in case.
i know you're probably gonna cringe at the idea but you might want to go ahead and buy a couple non-vegetarian things to have on hand, for kitty when he decides to be this way

i'd stock a little tuna, maybe a can of sardines, and maybe some of those small like 2 or 3 oz packages of lunchmeat. you can keep the lunchmeat in the freezer and then quick thaw it in some warm water if/when it's needed. i'd also, wait, did you say you have a baby? are they up to baby food yet or just milk? all meat baby foods are another good thing to have on hand and try with an inappetant cat.
also, you can warm cat food, or baby food, in the microwave for just a few seconds, maybe about 5-10, which brings out the odor and sometimes will stir appetites.
and i can't move on without addressing your insulin dose. you're gonna find that pzi once a day isn't going to work. i'm not sure how up on diabetes your vet is but cat's metabolize insulin twice as fast as we humans do so i'd perhaps do some searching/gathering data to back you up on that and bring it up with the vet. you don't want kitty to not be getting full day coverage of insulin, tied with inappetance, leading to ketoacidosis which can be very very expensive to treat. you'll find that pzi will need to be shot twice a day, roughly every 12 hours in order to get kitty day long coverage. otherwise there will be a good 12 hours out of the day where they have none to work with and his glucose levels will just be all wonky and regulation will never happen. definitely something to look into in the next day or two