Welcome to HCM
You took 20 mg Glimeperide which is sulfonyl urea and hypoglycemic drug.It is high dose and its half life is approximately 10 hours,but still can cause hypoglycemia
,so if you are facing problem get hospitalized and a intravenous glucose
may be given with monitoring of blood sugar level.
Peak effect of drug is already passed still you should take precaution.
In the mean time continue to take sweet thing food with good glycemic index
Please do not hesitate to go to hospital once you recovers completely,Please take care not to do such silly thing in life.
Please Take care
Best of Luck