I failed my glucose test!

So I failed my 1 hour glucose test and now I have to take the three hour one. I know it's because I hadn't eaten anything all morning and I downed that sugar drink. I DONT want to take the 3 hour one mainly because I have food sensitivity and my doctor wants me on a crazy carb loading diet for 3 days!!! What do I do?! Can I refuse and ask to monitor my blood and diet for 2 weeks?