I might have caused a little confusion in my thread OP when I referred to bowels instead of intestines. I still think I had a blockage somewhere high in my intestine which was causing food to be very slow exiting my stomach. This was the cause of the bloating and reflux for up to 6 hours after eating. When the discomfort a little lower down reached it's peak and it started to move down in stages to the dam busting moment was four days of rumbling, grumbling and churning.
It is now coming up to a fortnight since and all is well. I can have my dinner in the evening and toddle off to bed an hour later without any fear of it pushing up in my throat. No acid, no churning and no pain or cramps. My movements are satisfyingly regular and easy. Back to normal.
I don't feel inclined to head back to doctors now. For a year they failed to diagnose what might be wrong with me and told me that what it felt like just doesn't happen. Now I have nothing to show them.