Feel extra foggy, woozy, and dizzy after meals. Postprandial hypotension?

Lately, I've been feeling increasingly dizzy and foggy after eating, especially lunch which tends to be my biggest meal of the day. But after breakfast, I've had shakey chills for the past few days that lasts about an hour.

It's odd, because I feel my best in late morning. Today for example, I saw encouraging glimpses of normal late morning then right about when I finished lunch, in came the fog and dizziness. The worst yet, I felt almost faint. I feel wrecked.

I was thinking OMG am I diabetic? Maybe, but lunch tends to my most paleo meal of the day. It doesn't seem to matter what I eat. It doesn't seem to happen after dinner though. Doesn't add up.

Could it be postprandial hypotension? Unfortunately I don't have a BP monitor.

Anyone have any success dealing with this?