My male cat was breaking out all over his skin. The vet gave him several shots over a period of time that would clear him up but only temporary. This went on for 6 months. We then changed his food to science diet because we suspected a food allergy. Over the next 3 months his skin cleared up but he has had diarrhea on the new food. I had him on probiotics for 1 month but that didn't help. His litter box has to be cleaned out twice a day because he has so much diarrhea. He is missing the litter box or can't make it and has gone in other areas. This past week I started incorporating iams sensitive stomach. He is starting to have normal stools but now is breaking out and scratching miserably. I can't afford allergy testing . What do I do?