Hi CherylAnne,
Welcome to the forums!
I am the diabetic in my house. Yes, I have noticed mood swings, at times, over the years. Mine have come at home and at work. Most of the time, I can see them coming and prevent any hurt feelings.
I have never had the severe low blood sugar reaction that you describe. Mine has gone pretty low, but never totally incapacitated me. Either my diabetes is different or it is more controlled. The best way to handle a 'crash' is to prevent it.
It appears to me that Bill needs to have a serious talk with his doctor. Whatever it takes, he needs to get his diabetes under control. That should help both of you in the short term and him for the long term. If he isn't, he needs to get very conscientious about his medication, diet, exercise and monitoring. I currently check my sugar 3-4 times each day. If I don't feel well or think I need to check more often, I do it. How often is Bill checking his? Monitoring is extremely important.
I know there are others here who can and will contribute much more than I have. Maybe you can get Bill to come to the forums too. We are a very open group that is willing to share.
Good luck and keep us posted!
Travis