If you feel this way there's a good (IMHO) chance it will pass. The normal high-carb diet many of us eat results in spiky glucose levels. If you switch to a low carb diet you really feel it for a day or two. But then your glucose levels start to stabilize, and you don't feel the peaks and crashes anymore. You also don't tend to have sudden, intense hunger nearly as often, so it's easier to not eat between meals and to feel satisfied sooner when you do eat.

I've never tried fasting, but I've been on a paleo-esque diet for a couple of years now, and I rarely get hunger pangs or feel that "low blood sugar" feeling.

The fasting idea is interesting, I'll probably experiment with it.

Are you sure your blood sugar level really is low (hypoglycaemia), that is, have you had it measured? Idiopathic postprandial syndrome is apparently much more common, presents similar symptoms except blood glucose levels aren't actually especially low and unlike hypoglycaemia, it does not appear to be dangerous (unless you're driving and it interferes with your concentration).

If you suffer from actual hypoglycaemia, I would not recommend leaving it untreated.

In the case of idiopathic postprandial syndrome, episodes seem to be brought on by the steep decline back to normal blood sugar levels, as opposed to actual lack of glucose. What this means is you can avoid the problem by not consuming sugary food and drink in the first place, or combining them with other, non-sugary foods. Basically, don't let your glucose levels get so high in the first place. Fasting for a day shouldn't bring on an episode (although you'll certainly be very hungry!) - eating sugary foods, then fasting, will, however.

Of course, YMMV and I'm not a doctor or even a nutritionist.

I was like that when I started IF. I'm much better now. The biggest thing was reminding myself that I was crabby because of the food and I'd be able to eat soon enough.. that normally put me on the right track.

It's hardly an issue now, which I love.

Your body adapts quite quickly. I don't eat until noon, and am full of energy in the mornings.

My brother tried, and it only took two days for his system to adjust.

I get the same way from time to time, especially after a workout. I feel (but could very well be wrong) that it's a sign of insulin resistance.