Using bathroom ALOT after a race

I have to before the race, probably because I'm making sure that I'm well hydrated, plus the anxiety/anticipation probably has something to do with it.

I do make sure that I take care of the "other" things before I leave the hotel/home. Otherwise, I know that I would have to make a trip to the porta potty for that too, als due to the anxiety/anticipation.

Have not had much of an issue once the race starts and I'm sweating like crazy.

I find that I do. I assume you are talking about urination. I sweat a fair amount during any race and try to stay properly hydrated as well. I believe the cause in my case is the use of Hammer Endurolytes during the race, which causes water retention (I think). Thus after the race and upon no longer taking the tablets, I find that I am using the bathroom a lot more than normal.

Also, if you tend to overhydrate and do not sweat a lot, this could also be the issue.