stomach does not tolarate sugar

I am taking ocid (omnepazole) 20mg for 20 years + diet control+ an anti depression drug. My stomach does not tolarate sugar even fruit sugar. Within minutes my stomach gets disturbed, I feel thirsty, feel like passing motions, feel mildy giddy and feel like eating & eating. If i eat rice with beans(our staple diet) i start to begin to feel better.
My blood sugar is very normal-90(fasting). If i eat sugar or glucose on empty stomach say to measure blood sugar, within minutes I feel very weak and giddy, (no problem with rice.) My blood sugar now will be about 60. Then on eating my food & eating bananas, i come back to normal in 15 minutes
At social gatherings i feel abnormal and face questions, so i eat a little/ or pose  as if i am eating.
Can I under stand why this occures. Are there others like me? My daily life is ok. I work & do not show my problems to others.