Was bent slightly forward (not much) and it felt like something in the bottom right-hand side of my stomach had gone into a knot (it didn't hurt but was unpleasant) - don't really want to go to the doctors on a wild goose chase. Thanks.
Could be dehydration. Try drinking water and see if it goes away. When the duodenum is dehydrated it sends food back into the stomach, which in turn sends acid into the oesophagus, known as reflux. Don't bother with medication, just take water. Whether you have reflux or not, water could still help as dehydration is responsible for many digestive tract disorders. If water doesn't do the trick see your doctor, it could be a hernia.