Hi Missy,
As someone who has also lost a decent amount of weight, I can also relate to the preoccupation with the scale. Over the last five years or so I've lost about 40 pounds, most of it in the first year, the last five or so have come off slowly here and there. Last year was the year I resigned to not let the scale rule my life. Like Natasha mentioned, I weighed in constantly and my weight was affecting my mood. I would not say it was ruining my life, but it was definitely a big negative influence for me. If that number crept up, I was devastated. If it crept down, I was elated. But, I'm not sure how meaningful the number really was in regards to my size, strength, fitness level or health...and I decided those factors were the ones I really needed to focus on. I stay on track now by taking very honest looks at my body in a mirror on a regular basis. Preferably naked. The mirror does not lie. The scale is very fickle. Our weight varies depending on whether we are retaining water, and how much of our body mass is composed of muscle, whether we have eaten already or had a lot of water/fluids. It's too hard to predict what is exactly represented by that number.
It is possible to weigh more and be smaller than you were at a higher weight if your body composition is changing from fat to muscle. For that simple but undeniable reason the scale is not the best thing to use as a guide. I judge by my clothes, and the mirror. I feel so much better now that I'm not on the scale constantly, and I've not gotten any bigger since I stopped weighing myself. I've continued to get more fit and develop more muscle because I'm working hard and changing up my workouts.
I have found that logging my food is a better plan for keeping me honest than following the scale.
Eva