Hey your pattern seems similar to mine.
Fasting: 84
1 HR: 190
2 HR: 100
3 HR: 68
Hour 3 is my low point. Its too bad you don't have a 5th hour to see if it kept going lower. After hour 3 mine rebounds slowly.
The books all say that there is a wide variation among the population as to how low their blood sugar must drop before they start having symptoms. I only dropped into the 60s and started having symptoms. Also, the rate at which you drop is just as important. The books say you have 'relative hypoglycemia' if you drop more than 50 mg/dL in a given hour. We both drop faster than that from hour 1 to hour 2.
I am also constantly hungry. I have intense gnawing hunger even shortly after eating a meal. So you're not alone in that. I still can't figure out what causes that. I'll let you know if i have any luck getting that under control and how i did it.
I found Hypoglycemia For Dummies laid everything out pretty clearly.