Warning, long post ahead!
Hi Angel, welcome to FDMB, although I'm sorry you have to join us here. That said, there's a wealth of info here and hopefully we can help you.
I don't know if IBD and diabetes are linked or if it's just that unfortunate circumstance where once a person or animal has one health problem, they're then prone to others. There are a few of us here who have IBD kitties, although some of them don't have diabetes. I'll tell you a bit about my story and tag some of the others to chime in. There's a Facebook group called IBD Kitties that may also be helpful for you to join.
My cat Marshmallow was probably borderline both diabetic and IBD at the same time. She got a UTI (drinking and peeing constantly in January, so now I know she was borderline diabetic at the time). She had antibiotics, which triggered 4 months of diarrhea (now I realize she was also on the brink of IBD). The vet got the diarrhea under control with a steroid shot, which triggered steroid-induced diabetes. She was on insulin for less than 3 weeks, and she's now considered a diet-controlled diabetic.
For IBD I give her Budesonide, which is an anti-inflammatory that tends not to raise BG levels. Some vets give prednisolone, another steroid anti-inflammatory, but it can raise BG levels. Which medicine did your vet give Honey? I noticed an improvement within a couple of days. I used to hear rumbling sounds from her belly but the noises disappeared after just two days on Budesonide.
Is he throwing up or burping or licking his lips? Those things indicate nausea. Pepcid is good for helping that, and it's good the vet gave him anti-nausea meds too. Has he eaten since the vet visit? If not, ask for an appetite stimulant. Ask for Cypro, not Mirtazapine. The Mirtazapine can make cats spacey and weird but a lot of cats do well on Cypro.
As BJM said, IBD can make cats lose their appetites for a while, but then a few days later they'll eat ravenously. This cycle can keep happening until they get better regulated. Which food did the vet give you? EN? Z/D? The idea behind IBD food is that if you switch to a novel form of protein, it may be less irritating to the cat. Novel proteins are duck, rabbit, venison, lamb. Some kitties do really well on raw food. There's another Facebook group for IBD kitties and raw food.
I'm glad your vet gave Honey a shot of probiotics. IBD cats don't always get a lot of nutrition from food, they can just poop it out without absorbing a lot of nutrients because the inflammation inhibits absorption. Probiotics create a healthier digestive system so they absorb more nutrients. (Probiotics also help if there's any diarrhea or constipation.)
I give Marshmallow Animal Essentials Plant Enzymes and Probiotics every night. The dose is 1/8 tsp mixed into food twice daily. She also got noticeably better after just a couple days of this. She still has a little nausea so I'm adding another probiotic to help with that.
Please ask anything you can think of. We've all been in your shoes and we're here to help. Sending healing vibes to Honey.
Tagging
@Cat Ma,
@Laura Nels,
@dana moore,
@Larry and Kitties. Can you guys offer words of wisdom for Honey?
Shane