Become So Exhausted After Eating, Diabetic, Fluctuating Pulse Rate, Varying Cholesterol Levels. Any Relation ?

52 Year Old Female. I become so exhausted after eating that I literally have trouble functioning at all. I think that I actually doze while sitting at my desk. It doesn t seem to matter what I eat. As such, I am avoiding food until I am able to lay down afterwards. Because I am diabetic, I check my sugar level to see if this is the problem - sugar levels have been pretty good 5.2 to 6.3 - considering. However, my blood pressure seems a bit low for someone who does very little exercise (95/54) and lately, my pulse rate (normally 60 - 65) has had incidences of going down in the low 50s and high 40s. If I don t eat, until I am able to sleep, I can go all day feeling fine, have lots of energy and can get done what I need to do - like work for a living:). This is not a good practice, I know, but for now it is what I have to do. I have had all kinds of blood and urine tests done, scan of my brain, EKG , and xrays. Everything is showing up normal with the exception that my bad cholesterol and good cholesterol are on the wrong ends of the spectrum. Any suggestions would be helpful.