I can't help you with your schedule, though I'm sure others will give you suggestions. But congratulations on losing seven pounds! That's great!
As far as your motivation is concerned, here are a few suggestions, for what they're worth: Don't think about weight loss; think about your life as a whole. Think about your eating - what, when, why, how. Think about your priorities. Think about your non-exercise movement - the more you move your body, even at home doing housework, the better off you are. Think about your relationships with the rest of your family. Think about your brain. Think about your attitudes.
Think about your goals. Sit down and write out what your own personal goals are - physical, emotional, social, financial, spiritual, and all the rest. You want to write down *all* of them because they are interrelated, since they all belong to you. It may take you some time. But if you can get a clearer direction of where you want to head, it will help strengthen your wonderful decision to get healthier.
For what it's worth, I have a long-standing challenge with self-discipline. My usual tendency is to be lazy - sitting around dreaming of a quick fix and thinking life is much too hard, like a spoiled kid! I already like to exercise but, unhappily, I made excuses about my eating until I was diagnosed last year with high blood pressure (and heart disease runs in my family). So my immediate goal was to improve my health! I chose to go off my comfort-food addictions - I call them that because I eat like some people drink - cold turkey, set myself time schedules for every day so I wouldn't sit around, said goodbye to those fast food places I *had* to patronize because I was sure I was so busy, planned every mouthful of my good eating in advance and started to track it, continued my exercising, cut back on television and computer use, helped my resolve with motivational CDs (which have always helped me a lot), and lost about 17 pounds in several months, as well as helping the blood pressure readings. I'm still on medication, but I'm not off the charts!
Then Thanksgiving and Christmas came, and I let up on my discipline. It's tough getting back to it, but I'm getting there. After the past half-year I know I'd rather discipline myself than float around. When I start whining to myself that it's too hard, I remember something that I have read: "Life is tough for *everybody* - but, generally speaking, the tougher you are on yourself, the easier life will be on you."
Figure out what you need to do to keep your life going in the good direction you've set, and go for your goals. We'll be cheering you on.
P.S. Hang on to those exercise DVDs. When you can't make it to the rec center because your son is sick or the weather is awful (even in Dallas), they will be your substitute friends!