I've very glad that Morgan is feeling better. The symptoms that you are describing are consistent with a group of illnesses called IBD (inflammatory bowel disease - please forgive my earlier mistake of calling it irritable bowel). The symptoms can seem to go away for a time and then reappear. ...
Your cat may need more fiber in his diet, which you could do by putting canned pumpkin in his wet food. It doesn't take a lot, about 1/10 pumpkin to 9/10 canned food. Do you feed kibble and canned, or only canned. I switch my own cats canned food around regularly with no issues but if kibble...