Trach care and GI bleeds are bad I agree, but the only thing I have had to do that makes me gag everytime is putting down a NG. If I ever had to have one myself, they'd have to put me under first.
I passed the test the first time, was on the computer. Answered 75 questions and was done in 40 minutes. I'm very thankful, I don't think I could have handled the stress of having to take the test more than once.