Did you contact your regular vet when it happened? They said he'd be fine? The amount of real cocoa in a milk chocolate kiss is minimal. (it's more sugar than actual cocoa) If you're still uneasy, go to the vet. Any money paid would be worth your peace of mind.
My younger brother once went out leaving a bowl of grapes on Kaji's ottoman. A WHOLE BOWL OF GRAPES for 2 hours alone. I called my vet, and they tried to calm me down. They did not have me induce, and did not suggest I bring him in as they were about to close and I lived 40 miles away from my trusted vet at the time. They told me he was going to be fine, especially if in 2 hours Kaji had shown no signs of distress. I worried all night. I stayed up watching him breathe, waking him up every 30-40 mins. He was so annoyed with me. I regret not taking him in to the local vet. He was fine though. Never had a reaction from the grapes that I think he may/may not have eaten.
__________________ Littlest JakJak 
We miss you Kaji 
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