ADD and water diabetes

So i have been taking adderal for about 2 years now, and i know a side effect is dry mouth.  I therefore drink alot of fluids during the day, more than the usual person.  I always need to have a drink with me or I become extremely uncomfortable.  I have also been urinating alot, and sometimes to the point where I think i might not make it to the bathroom.  I told my doctor about my urinating problem, and he basically dismissed me saying i was too young for a bladder issue, im 25.  Anyway I was doing research on bladder things and I read about nephrogenic diabetes insipidus.  it can be caused in adults by a reaction to medication.  I was just wondering if anyone else has had similar problems or has any advice, or suggestions on how to get this under control?  thanks so much