99% Of The Time After I Eat Something Sweet, Sometime

99% of the time after I eat something sweet, sometime just after I eat. About 10 minutes or less I start having blurred vision, which turns into double vision . I get disoriented and just go out. The next thing I know I'm waking up anywhere from 3 to 6 hours later. Still disoriented and very shaky inside and out. Please help me. Also sometimes I wake with bad headache