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Hello. Thanks for the question.
I actually like to add some fiber to the diet when I have a dog with diarrhea. I typically have the owners give 1-2 teaspoons of canned pumpkin or sweet potato baby food with meals. That can help firm up the stools.
I would try to get him on a steady diet. The constant changing can, in itself, lead to nausea and soft stools. You really need to get him on something steady to get the gut flora controlled and steady. If you need an appetite stimulant, I would talk with your vet about using Mirtazapine as needed.
I hope this helps, let me know if you have any other questions.