Yesterday was the day I boarded a plane to Mexico. I was fine on the first flight. On the next flight, I woke with a dry mouth and had difficulty swallowing. I thought i was dehydrated because I hadn’t really drank much water. After drinking lots of water while waiting for next flight, The same thing happened again. Swallowing was only bearable with water. After sleeping on way to destination, I felt completely fine. Now it happens repeatedly. I feel fine after a nap but it keeps coming back.