I suggest that you ask for a referral from your current GP to a specialist. Your symptoms are severe and uncomfortable for you, as well as puzzling. Have you seen a doctor who specializes in autoimmune diseases such as lupus, Sjogren's Disease, etc.? That might be your next step. I hope that you resolve this health issue and soon feel better.
If you have not done so I would strongly recommend getting tested for diabetes, thyroid problems, and maybe other metabolic conditions. Diabetes is actually what sticks out most in my mind because of the urination, fatigue, and bad breath. (And because it runs in my family like wild fire so I'm almost always thinking of it/ trying to prevent it.)
AT the very least it sounds like you have inconstance and you should try working with a doctor to help limit that. I know that could be helped by having physical therapy (kegal exercises) that can be done and/or medication intervention as well. All those bathroom trips are certainly effecting your quality of sleep, but honestly I think they are just a symptom.
try going back and asking to get tested for Mononucleosis (mono) ....it causes flu like symptoms and for as long as you've had it...it fits the description..but Im not sure..it just a suggestion...