Confused about hypoglycemia, i have low blood sugar level but the doctor told me to not eat any sugar?

He likely diagnosed: Late [4-6 hour] after-eating low blood sugar -occurs because you lost 'first-phase Insulin release [ patients at risk for diabetes] with this, sugar rises, get increased second phase release of Insulin , and , especially with sweets at prior meal, causes a mismatch of food absorbed and Insulin level, causing hypoglycemia 4-6 hours after eating responds to avoiding sweets but incretins will work.