I know this is an old post, but in case someone is searching for an answer to this topic as I was ... I thought I'd post. I had the same symptoms ... urinating as many as 24 times per day. After being on about 10 - 12 round of Antibiotics in the past year, they completely upset the balance of my system allowing Candida to grow. I suspected this, but after following doctor's orders for tests ... urodynamics, cystoscope, ultrasounds, CT-scan, urine cultures and bloodwork ... I was diagnosed with Candida Glabrata in my urine, thus bladder. Several months ago I'd also had it in my mouth ... I'd had some dental work done (for which I had to premedicate with Antibiotics ) and thought it somehow was introduced at that time. Apparently it was throughout my system.
I was first diagnosed with C. Glabrata by the urologist and referred to an Infectious Disease specialist for treatment. Not all strains of Candida are treated the same way. In fact Glabrata can often be resistant to drugs like Diflucan, one of the most commonly prescribed antifungals. Courses for Glabrata are often months while you may only need to take medication for one day with other forms of Candida.
My suggestion for anyone suffering from these symptoms is to first have a culture done and also see a urlogist to rule out any bladder issues. An infectious disease specialist is your best bet for systemic Candida diagnosis and treatment. Antifungals can cause liver damage, so you really want someone who knows about the treatment protocols for this medical issue ... don't mess around with your family physician or Internist unless they can convince you that they're well-versed and knowlegdable about this area of medicine.