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When dogs are prone to seizures there are several "phases" they can go thru. There is a pre and post phase of seizure activities...they don't have to have both or either, but usually do. The pre phases usually involve anxiety, fear, pacing, panting...it is their ability to "know" something is coming. This phase can brief as in seconds to several hours. The post phase is usually weakness and disorientation and this can last minutes to hours. It sounds like what you describe is the post phase...so when you found your dog dazed...it could have been after the seizures. I have had some dogs dazed for a day or so.
Chocolate usually causes excitatory behavior and in to great of levels seizures and toxicity...but it takes more than just a bite of brownie.
The course of action when you get to a vet is usually bloodwork to determine if there is an "out of brain" reason for the seizures like liver disease. If they can not find a problem, it is up to you to decide if whether you want to start antiseizure medication.
As far as jealousy...dogs just realize when there normal schedule is changed...and that can be distressing, so make sure you are giving him so quality time.
Let me know if you have further questions.