Hiyah Losing, and welcome to the board. Great to see another Ottawa face

Not sure about the new constant need part of the problem, but you should be drinking a minimum 64 oz a day (8 glasses) and then 8 oz for every 25 lbs you want to lose. It could be that because you flushed out so much excess water during the first few days you're feeling thirsty now. Drinking water is definitely good for you, specially if you're drinking it to the exclusion of other things like pop or coffee/ tea, so I wouldnt worry too much.

Keep an eye on things and if you're thirsty by all means drink up.

Nat