The spicier the food, the slower/less you eat?
There's also the link to certain spices (like chili peppers) that are highly anti-inflammatory.
Personally, the more spicy food I eat, the more I have dessert.
Negative. Water actually amplifies the sensation. The sugar in the desert counters the sensation, as does milk. If I go awhile without eating "11" hot, when I return I have to follow it with milk or sugar(or both=Thai Tea or Cafe Sua Da). Otherwise, the subsequent burning sensation can be quite unpleasant. I always go to "11" when I feel a cold or flu coming on to combat the contagion, it works 9 times out of 10. YMMV.
Yes. However, if it is very cold water, then it lowers the mouth temperature, which could take it below the 'heat' threshold.
You'd have to keep drinking it though, because after a moment, the temperature returns to normal and the burning sensation returns.