wow, same here!!! today is day 2 for me on pre-op and i woke up feeling alot better than yesterday. i had a migraine, had the shakes and cotton-mouth by noon just to feel alot worse when i went to bed. i figure it's all a part of withdrawl. i noticed today that i wasn't as hungry but extremely thirsty for ONLY water. how amazing is that? i just hope the rest of pre-op will only be easier for me. good luck 2 all.