Alternatives to traditional glucose test?

So I've been having gallstone/gallbladder attacks off and on throughout my pregnancy. Majority of these attacks are triggered by sugar. It is awful, but there's nothing I can do besides eat healthy and wait until after Baby gets here to see if I need it out or if it resolves itself. 
Anyway - I have my glucose test early next week and am completely freaking out because my gallbladder has not been tolerating sugar well the past few days. I don't want to drink that sugary stuff and be in unbearable pain afterwards!
Does anyone know of an alternative gestational diabetes test besides the super sugary drink? I wanted to check here before calling my dr and having them think I was crazy for even asking :)