Question : eating sugar & feeling horrible

This has been happening lately to me,

I eat a regular amount of sugary foods and I start feeling horrible. About 4 minutes later I feel nauseous and drowsy.

It can be as small as a bagel with strawberry jelly.....

I don't eat this everyday or massive amounts a week. Probably just 1-2 a week. Everything else I eat fruit for my sugar intake.

Does this mean something? ? Does this happen to anyone else?

I won't be taking the glucose test till 2 more weeks.....