Aw, I'm sorry to read this - poor him & poor you, too (((hugs)))
Have you moved as yet or is that all still on the go?
You could, on the off chance it may help calm his tummy, reduce the food to just boiled rice with a little scrambled egg and perhaps a little probiotic yoghurt if you have any in. Possibly try lots of little meals like when he was incy again
although it may feel like a backward step sometimes it can be a case of two forward, one back
Everything crossed for you with Ozzy's iffy tummy and your pending move - hoping for calmer waters ahead.