Turning 40 and need to lose this weight

So, I've been doing the insanity program every morning and tracking my calories here on Fitday.  I can tell I already have so much more energy and my pants are actually a tad bit loser (still tight...but at least I can button them now). 

I did a lot of research on how to determine calories burned...and so I've bought a heart rate monitor to accurately calculate how many calories I burn a day and make sure I have a negative balance at the end of the day.  I

When I went to college I gained 15-20lbs the 1st year so I started Nutri-system.  I lost 30lbs on Nutri-system, but as soon as I stopped the program, I gained it all back plus 5-10lbs.  A year later I wanted to join the military and I had to lose about 10-15lbs to reach the military's weight limit. After joining the military, I got pregnant.  I weighed 152lbs (5'2") after pregnancy.  I started walking everyday...picking up speed/distance and watched what I