I'm so sorry to hear this. Even though he's been okay in the past about eating table scraps, as animals get older they just can't eat the things they used to just like we often can't. I learned the hard way with my senior cat Storm and he also got very sick. Please don't feed him any more table scraps even though he looks like he wants them. They just aren't good for him. Lots of prayers and positive thoughts are being sent his way.