I would call poison control. They should be able to give you more specific information about the toxicity of the poison you used. I’m looking at the active ingredients for the Zevo ant and roach spray and it looks to be mostly essential oils, which could cause some irritation but it’s very unlikely they would cause a systemic reaction. I agree that bathing him could cause more harm if he got too cold. Do his ears feel warm? You can place a blanket over him loosely and provide a warm bottle to cuddle.
It is possible these are unrelated things. In any case, I would keep up supportive care overnight (keep him warm, syringe feeding, belly rubs) and get him to the vet ASAP if he doesn’t improve.
.
.
.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.