A couple of times when i ate "plenty" of sweet things like watermelon, date, jam, cookies, i got headache and feet shaking.my moms got diabit.do i have?

Hypoglycemia: Your symptoms surely sound like hypoglycemia. When one eats a lot of sugar, especially quickly, and they have a tendency to diabetes the pancreas can put out too much Insulin too quickly causing the high sugar in the blood to immediately be absorbed by the cells and having your brain feel you are hypoglycemic. This phenomenon can be managed by not eating high content sugars or having big meals.