I had to laugh when I read your post, you sound just like me! I have panic disorder and have to go get the 3-hr. glucose test but am scared to! So I did it at home with my meter; and yes I am going to be diagnosed with diabetes. My 1-hour level was 223 and my 2-hour was 160. So of course I don't want to go have the test officially, because I felt nauseated after drinking all of that sugar. Plus, when my sugar was at 223 I felt very hot and sweaty. Of course, it could have been my nerves but I don't know. The other day my endo asked if I ever had low blood sugar. I said I don't know because I have panic attacks. He asked if I felt better after I ate something. I said "sometimes, but that could just be psychological on my part, because I thought it might be low blood sugar". (This was before I had a meter.) He just looked at me; he has to think I am absolutely crazy!
But I totally understand the anxiety associated with the 5-hour test. Could you do the test at home with your meter? I would talk to the doctor about your anxiety about it and see if you could mimic the test at home, by drinking the 75 or 100 grams of glucose drink (I used 24 ounces of Sierra Mist-78grams). And then if you start to feel sick you could keep checking your sugar, and if it goes too low eat something. I don't understand why you would need to make yourself sick just to show your doctor how low it can go.
5 hour oral glucose tolerance test 
You Are So Me! 
