Before getting scared about your blood-sugar levels, just analyze your diet and sleeping first. Of course, if in doubt, a doc's visit won't hurt.
On eating and sleeping:
1. sleep well, at least 7 hours. 8+ is ideal
2. CARBS! Taper them off later in the day, and only eat good carbs (oats, sweet potato, 100% whole wheat, lentils), but make sure you get slow-digesting carbs for breakfast, and one more meal (lunch) before lifting.
3. sugar! Take fast-digesting carbs too. This gives me energy like there's no tomorrow. But ONLY before lifting (about a half hour). Otherwise, your body will store it as fat. I have 2-3 normal-size chocolate chip cookies before lifting, along with 25g of casein protein. I also have the same amount of cookies after lifting, with about 50g of whey. You need sugar immediately afterwards too if you wanna grow. Avoid sugar and other simple carbs (like white bread) all other times.
4. Find a pre-workout that you like. The caffeine in pre-workout drinks acts as a stimulant, and the creatine also helps.
Not energy related, but every single meal must contain protein.