that is great...21 lbs! the pshchology thing is very important.
my advise is a healthy mind renders a healthy body. it is when you let the body control the mind that we get into trouble!
i have been there myself...lost..gained...lost...gained more..lost..and so on...this time a way of life is my goal..not another no fat diet...that i fall off of and gain 30 lbs in 4 months!