Advice about Incontinence?

I wet the bed almost every night and it is not just once. I do not usually wake up till morning and it seems I wet several times as my diaper is totally soaked through. I usually don't have any problems during the day but if I do it is because I have almost no warning that I need to pee so it makes it very tough to make it to the bathroom in time. other times I have plenty of warning and make it just fine. I am a big water drinker due to some other medical problems that I have that can cause severe dehydration and serious repercussions from that. So cutting down on fluid intake is not an option. the Doctor so far sees no reason for the wetting but would like me to go to a urologist for further investigation into the problem. I know that my bladder is weak but it has not been a big issue until the last few months. I only had occasional accidents at night mainly when i was sick. But now it has been ever night. Any advice is welcome please no rude comments as this is an actual medical problem.