I have type 1 diabetes & had a severe hypoglycemia episode yesterday (went unconscious). What effect does this have on my glucagon levels?

Hypoglycemia. Glucagon is normally a pancreatic hormone that counterbalances insulin. Glucagon normally goes up during fasting to bring blood glucose up. However, in many people with T1DM, glucagon secretion becomes dysfunctional, and may not bring your glucose up. If you have had a severe hypo like that, see your doctor to discuss how to prevent this.