6 days post op - maybe a little dehydrated?
Congratulations on getting your surgery done!
Staying hydrated post-op can be difficult, esp with travel thrown in. About all you can do is to keep some form of liquid with you at all times and remind yourself to sip on a frequent and regular basis. If one form of liquid doesn't work, try others, or try different temperatures, even different brands of water can make a difference.
And if none of that works and you feel dehydrated and crappy, take yourself to urgent care or the ER and get tanked up via IV. Not fun, but sometimes necessary.
Larra