Diabetic, but high uric acid. Seeking diet tips.

Hi, I am diabetic but due to a staghorn calculus with traumatic removal and change in diet, I no longer take diabetic meds. On f/u MD visit yesterday, a 0.2mm stone was evident on Xray. Was told I would probly pass with increased water intake (like 64oz/day is not enough) and a low purine diet. MD also started me on Allopurinol, 100 mg. The goal is no meds, not more! How do I do that and maintain my blood sugars in normal range? My sugars levels are great and I have lost 65 lbs rather rapidly due to 5 hospitalizations in 8 weeks from various complications due to stone removal. I am in end of week 12 and very discouraged.