I can lose 6" off my waist if I eat a huge amount of pancakes until i burst one night, drink a ton of water, sleep it off, and then in the morning, my stomach is flat again. Poof! Difference of several inches.
I only say this because 12 lbs in 10 days sounds like a serious crash diet of the month as outlined in Cosmo or Woman's Day with a side of natural fluctuations that distort the true number.
Be careful! And be sensible. Make sure you are not simply dehydrating yourself too.
Hopefully I am wrong. Otherwise, congrats on the great kick start.