As I explained to you earlier, it's not uncommon to feel worse before feeling better with thyroid treatment. (You did see that reply, didn't you?)
Two weeks isn't even a blip on the thyroid radar screen.
And I'm not sure how you can blame Synthroid for the dehydration the water pill caused.
Doctors don't prepare us for the upheaval early treatment usually causes. That's why boards like these are so useful, because they report what it's like for real patients here in the trenches.
You're only hurting yourself for the long haul if you give up now.