Newly discovered after colonoscopy prep

I think I have always had that feeling like I need to eat or I will pas out, ever since childhood and now worse in middle age. I have normal blood work, fasting glucose, and normal A1C but woke up the morning of my colonoscopy, after completing both split prep doses, and was in a complete panic. Could hardly walk, couldn't remember how to get dressed, had to sit down and check my pulse, which was 145. I was in a complete meltdown and couldnt get to the car to go the appointment. As soon as I put even one cracker in my mouth it started to get better. I feel freaked out, and don't want to repeat that ever again.