Always useful to try to trace back to a possible cause in order to treat appropriately if possible. Testing for uti is not always accurate and if comes back "clear", may be more hormone-related. Stress may be triggering your adrenal glands, where more and more oestrogen is produced (or less and less depending on how you look at it!) as opposed to the ovaries as time goes on. So what you are producing may be getting gobbled up adrenally by the hormones there. Keep it simple for now though. Drink plenty water. Glad you're feeling better today. Rest if feeling fatigued.