Glucose test question

So I had my one hour this week failed it by seven points, no big deal I failed with my first pregnancy as well so I expected it. So today I had my three hour. I passed my fasting blood sugar drank the drink passed the one hour and two hour and the nurse told me since I passed 2/3 I don't need to wait around for the third. So I go in a room to see the doctor and she tells me I passed but they still want to test me again at 32 weeks. I'm 26 weeks currently. I am overweight but I also was my first pregnancy and they never made me do it again. I've only gained two pounds this pregnancy and my baby is only measuring barely a week ahead so I feel like the only reason they're doing this is because I'm overweight so I obviously must have gestational diabetes. My question is I'm thinking about refusing the test again because it really makes me feel awful, sweating dizzy light headed the whole nine. Not to mention I still have terrible morning sickness so drinking the actual drink and keeping it down is hell. Would it be dumb of me to refuse or ask for an alternate test? I don't feel like I would be risking anything but I just wanted other opinions, I have another check up in 3 weeks and I'm seeing a different doctor within the same practice and plan on asking for a second opinion and discussing it then as well.