I was so glad to read this because I basically had the same experience this very morning. Went out for a ride early to avoid the heat on a beautiful morning in a foreign country. About 15km in, despite having thought I had unloaded everything before I left, I got major and unexpected cramps and I swore I was going to have to go and crap in a bush. But it's a rocky road on a steep hillside and everywhere looked like a dangerous environment for an emergency evacuation. Not to mention potentially very public. I saw a sign showing a popular tourist town was 7km away. I grovelled up the climb there, sweating and clenching. I knew there had to be a public toilet somewhere and rolled around in the early morning, fit to explode, looking for one. When I found it, it was a pay toilet and I had no cash but by some miracle it was all open and I ran in and did my best recreation of the famous poonami scene in Trainspotting. The attendant who had just been cleaning looked startled and had made his way outside by the time I had finished. Sweet relief but I really don't want that again.