Here is my story with sweeteners......
DH and I were using Yellow Package sweetener in everything and all was going well....so we thought. We realized that we were having to get up at night too many times to go to the bathroom. We cut back on liquids after 4 pm but that did help at all. I began researching the sweeteners to see if that was an issue and discovered that the sweeteners can cause our exact same problem.
We did not change the volume or timing of our liquid consumption, but began using the natural Stevia (not the kind containing sugar alcohols or other additives...just plain Stevia) and within days we were back down to one trip per night.
I shared our findings with a few friends who were having same issue and they had similar results.
I only use it in my iced tea so I can still enjoy my southern iced tea.