Can't help on the attitude...it's justified...but I can sympathize with anybody taking a 5 hour (even 3 hour) Glucose Tolerence Test. Been there. I'm hypoglycemic, which means my blood sugar falls (way) below where it should oughta. Pancreas produces too much insulin, they say. Maybe I should bottle it for others that need it? Anyway, I've felt your pain, and I don't blame you for walking out. However, I suspect that means you'll have to go back and suffer through it again...so maybe it was not the swiftest move. Passing out would have gotten you in quickly, I bet...
Anyway, the reason I had to go through the tests was that I had to have a physical for disability insurance while I worked in the shipyard in Ballard. I made the mistake of admitting that I was hypoglycemic, so had to take the 5 hour GTT. Guaranteed me a splitting headache. And failed. Tried a 3 hour. Failed. Finally took a 5 hour again, but this time, I had a 3 egg omlette, a big glass of milk, and a huge bowl of Cheerios prior. Passed fine. If I'd puked all that up when I downed the syrup, I woulda been busted. But I didn't, it was worth it, & got the insurance.
What happens to me is that about 9:30 ~ 10:00 AM, my blood sugar falls dramatically. A Diabetes Specialist at Virginia Mason Hosp. (a major research center for Diabetes) said he'd never seen a graph like mine...the real one, with real fasting. So, I'm special after all.
Steve