Hi there . . . Sounds like you definitely need a

. . . You've taken a very important first step on the long and sometimes bumpy road to better health and fitness just be joining the grou[ around here. You will find so much support and friendship everywhere you post on this big site.
Please don't try anything really drastic and unhealthy. You've got your wonderful children to consider. While they definitely can benefit from a happier MoM; the really need one that stays healthy too.
Getting formal exercise in when you've got a couple of little ones around can be difficult. Just try to get moving a little more every week and remember that the great "they" (those many nameless experts out there) mostly agree that healthy weightloss is about 80% in the eating and only 20% in the moving -- especially at the beginning of the journey.