This patient support community is for questions related to juvenile diabetes including celiac disease, depression, diabetic complications, hyperglycemia / diabetic keto-acidosis, hypoglycemia, islet cell transplantation, nutritional issues, parenting a diabetic child, pregnancy, pump therapy, school issues, and teens with diabetes.
It might be time to get a referral to a CDE (certified diabetes educator) when you talk to your doc about "how low is too low" again. I mention this because if you have trouble going 2-3 hours without going too low, your meds may well need to be adjusted.
Our needs change over time and if our medication and eating doesn't change at the same time, we can end up running too low or too high for too long. I wonder if now is the time for you to re-evaluate your routine with your doc and/or CDE.
Even as a longtime diabetic, I learn (and re-learn what I've forgotten) when I make the time to talk to the pros again about the daily issues ...
Good luck.