Going to the bathroom often (urinate)

Patient: Ive been going to the bathroom a lot for awhile now. I went to the doctor and they said they coudnt find anything took blood test and everything no diabetes or anything, it did show that my B12 levels were elevate. I workout 4 to 5 times a week and eat pretty clean. Any ideas of what it could be?

Symptoms: Frequent restroom trips

Doctor: