Why am I shaky, weak, and dizzy?

for a few weeks now I have been feeling really weird. Sometimes I get these spurts of energy without any coffee or caffeine and then I crash. That's only happened a couple times though. I am in bed right now and it's taking a lot of energy just to type. I feel very weak with dizzy spells and a shaky feeling like I haven't eaten even if I have. It seems to be progressing a bit. I don't know if I should be concerned or not. A friend with diabetes told me I could be hypoglycemic and I should take a blood test. She checked my blood sugar level and it was 79. If there is a nurse or doctor who can give me some answers? I am not financially stable to go get blood work so I'm just going with it..thanks!