Oh my..... I'd give him a 4 week break from eating now, and give him some Nutribac in his water. Good for his stomach and the 4 weeks without food for loosing weight. Then start with a pinkie, after 10 days 2 pinkies, after 12 days a fuzzie and after 2 weeks a hopper, then after 16 days a weaner and after 18 days a small mouse to end with the slimming schedule of 1 mouse every 3 weeks. But since I am not an expereienced expert, this is just my interpretation of all I have read. The best expert on regurges is Kathy Love, so you can allso take a look in the manual. She allso recommends Grapefruit seed extract for stomach problems involving bacteria, viruses and parasites, but yours might have problems because of the fatty deposits. Giving GSE would not hurt anyway though IMO. It helped 1 of my snakes bounce back from stomach problems. Good luck with this one!