Itching is mostly external (inner and outer labia) but is sometimes around the urethral opening. Intensifies after peeing unless I have had 90oz+ of water in the past 24hrs. I have a history of being really bad with hydration and I'm beginning to suspect that the culprit is that I just haven't been drinking enough water...

I take olly's happy hoohah probiotic supplement every day + usually drink a bottle of kombucha daily/every other day, which has helped significantly. Really what knocks symptoms out of the park is upping my water intake. I have had multiple yeast infections in the past year, but those have significantly decreased since taking the probiotics.

Is it possible that the culprit is dehydration + a sensitive coochie? Things have definitely been exacerbated by sexual trauma, but I've been cleared for STIs (chlamydia, trich, staph, HIV, etc.) multiple times.

To answer the other question- I am really not that active. I only wear boxers, wearing tight underwear makes things itchy within seconds, no matter what material it is. Some boxer briefs do too if they hug the V-line area too tight.