i have the opposite problem i dont forget but i cant get out of the shower again i get stuck in there with my thoughts  adhd is very much a visual impairment disorder if it leaves you eyes you forget it thats why lists like post it notes work really well and constant calender reminders we forget things because we seek new dopamin so we look for new stuff all the time - unintentionally so when we close the showercurtain we essentially lock our self in with our own thoughts and we get stuck there  so have somekind of signreminder in the shower to get out it could also be a timer on your phone or a simple egg timer