Our expert says:
Well, I suspec God would agree that simple anxiety ( and some people do feel unreasonably anxious when needing to travel ) can both make one one's bowels ( and/or bladder ) actually more active so that one needs to pee or poop ; and can make one feel excessively aware of any bowel or bladder sensations so one would feel such a need unnecessarily, or the actual mild degree of need would be amplified and exaggerated so as to feel awfully urgent, when, if one was not paying attention to it and worried about it, you would probably not even think of it, or feel it, until later when there was a convenient opportunity.
And this tends to get worse in a cycle - if this happens even once, coincidentally, you feel increasingly anxious when you are going to travel, you anticipate and expect the problem to happen - and your anticipation and xtra anxiety make it more likely to happen. And the more often it happens, the more you expect it, and the more it happens. And so on.
What would be very likely to help most, would be to see a good local psychologist offering Cognitive-behaviour Therapy ( CBT ). This would help you to unlearn this most inconvenient habit you have learned. You would learn how to avoid becoming anxious in this way, how to deal with such anxiety when it arises, and how to regain a sense of control over bowels and bladder, so the problem need not recur.
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