Trying to restart and having a hard time

I am trying once again to jump start my losing weight since having my daughter a 1 1/2 yrs ago. I struggle most days to just have time for myself with three kids. My son is going through the stage where he knows more than his mom and dad and is constantly arguing with us about everything. His grades are beginning to slip which is very unlike him and I know he is dealing with bullies but there are certain things you have to take on yourself to make them change and he never will. I have went to the school but they are of no help either. With him turing 11 a few months back we are beginning to go through puberty and changing in some ways so it's really hard there. Then our 10 yr old daughter is dyslexic so I have to constanly help her to make sure she is getting her work done right and being in 4th grade that is a challenge for most any parent now days. She is doing real well though I have to admit and her speech teaching is doing the Susan Barton program with her and it's helping as well. I work with her teachers very closely to help keep her from slipping to far on anything so she does not get left behind. The no kid left behing act is a joke now days especially in my daughters case because this school would have left her behind had it not been for me and her dad standing up for her. Now we have our little one who is 1 1/2 yr old and boy at 40 I am finding it harder and harder to keep up with her moving do fast. She is my climber and loves getting into everything but love her to pieces and she really know when momma need a kiss or just to be loved on. She is how I make it through most days but she makes it hard to get my exercise in. I have started back this week with my Walk Away The Pounds dvds with 1 and 2 mile dvds. Since I haven't been exercising in almost a year trying to start back slow so I don't mess anything up. I just have a hard time fitting what I need to do to lose the weight in will all the other things of the day. When I stress with the kids things that then makes me eat more and that is not just sweets it most anything I have in the house. I must find a balance to be able to achieve all my goals I have which are to lose 100 pounds, eat better and show my kids that you can achieve anything you set your mind on. Such a challenge though for me with this daily and so ready for a change.