Like "Yes, that was where I was going. Prevent it from spiking by giving yourself some food to work on overnight. Since you say you don't get back to normal, it also sounds like you have several dumps per day or burning too quickly. Take a good look at your food intake. It really sounds as if you're not getting enough for the amount of exercise you do. Also, age is a huge factor. It seems like things just happen overnight - 16 years ago your body may have been able to handle it differently."