Gallbladder Flush during pregnancy?

I'm in my 3rd Trimester pregnancy, and 2 days ago i was hospitalized b/c i had a gallbladder attack, it was very painful, and my OB-GYN prescribed a NON-fat diet-to prevent any further attack, but it's no working at all, i'm afraid to eat anything, this episodes of pain are unpredictable do you think the gall bladder flush could be safe, rite now i'm 36 weeks pregnant??? please any advice will be greatly appreciated. Thank You.