Nearly Passing out when you eat isn't fun.

But I do it.
My vision goes black.
I get dizzy.
It's scary.
And it happens a couple hours after I eat.
Also, we're taking some of our cats to a farm. We've got too many of them.
I stayed home.
Too tired and sick to leave the house.
I really am really tired.
Eating food is supposedly life giving, so why does this keep happening?