You will have to be very careful about seizures. My son had many of them during his lifetime and did pass on about 4 weeks ago with one of them. He was 31 and was diagnosed at 5 years old.
At the time of his passing it seemed he had a bad bout of the intestional flu and must have had a seizure and then his heart just stopped. I do know for a fact that he was not good about taking his anti-seizure medicine. That is one thing these people HAVE to do..
Could his seizures be caused by something other than diabetes?
Has he seen in a neurologist?Not just in the ER, I mean, but for a more extensive workup. It's not impossible that he has a seizure disorder (e.g., some form of epilepsy) that is not related to his diabetes. An electroencephalogram (EEG) could be helpful, even, if necessary, a 24-hour one if they couldn't otherwise catch the seizure activity. Good luck.
I am not a physician, but the mom of a type one diabetic and the daughter of a type 2. I would suggest that you discuss these seizures with your endocrinologist immediately. Your husband could be having low while having the seizure, or coming down too fast from a high. By the time it is done as the body is release stored glucagons, and when you check the blood it seems normal. There could also be other things that are causing it.
There is a genetic test that you can have done for your son but this will only tell you if has the gene not if he will get diabetes. Unfortunate there is no way to prevent or to predict who will and who will not get diabetes.
You did not state whether your husband is on a pump or shot. I would also ask you r doctor about the continuous glucose monitor. This might help narrow down what is really going on with your husbands, blood sugars. There is also a pump that has the monitor with it.