Dehydration?

ClaudiaStar21

I have felt dehydrated for a few days (dry skin, chapped cracked lips and now horrible constipation ). So for the last 3 days I have upped my water intake to well over a gallon a day  (like a gallon and a quarter to a gallon and. Half) but I still feel dehydrated (and the constipation is the worst I've ever had). Anyone experience this? Could it have to do with bf? Should I take off of work tomorrow and try to get into the doc ( and which one? Ob or general practitioner?)