Are you taking a diuretic (like Lasix/furosemide)? That might be the culprit. If so, see if your doc is OK with you taking it in the morning rather than at night, at least on backpacking trips. My mom was originally prescribed to take it morning and nighttime but a visiting nurse had her take it all in the morning (with doctor's approval) and now she does not have pee problems like before - you can imagine a slow-moving senior getting up with a very full, ready-to-empty bladder first thing in the morning! Waterfall city. Now she just has to go many times in the morning after taking her diuretic, which is much easier on her...and the floor.

Or just keep a pee bottle in your tent...