Awww.... Thanks everybody!! He is getting better and better.
I started him back on his bag of Primal Chicken Formula, this a.m., which is what he was on before I switched him to the Lamb.... and so far... so good. He Loves it so much, he screetches high pitched and does circles in the kitchen when I am getting it ready, for him. I'll continue to give him Benadryl for the next couple of days until it completely clears up.