Don't hold back...

Let's see....I getting ready to turn 31 and I'm feeling really down about how things are going. I'm now working 2 jobs and going to school full time. I don't really have time to eat or sleep let alone do the work that is needed for the classes! I feel like I'm killing myself for no reason. The last time that I went to court w/ Greg we got outside and he said to me that he just couldn't afford this!!! He is the reason that I'm working so hard! I have to make sure that the girls have what they need and to do that I need money whether or not he does his part. I have a new bill of $145 a month just for my oldest ones braces! I basically work to keep them in afterschool care, school lunches, school pics, field trips, clothes, doc and dentist visits, and now BRACES! I have enough money left over to put gas in my car to go to the 2 jobs and eat when I actually have time...that's it....nothing else! I'm tired of having to neglect myself because my sorry ex won't do his part! By neglect I mean going to the doc and dentist myself! I haven't been in 8 and 12 years respectively. I'm probably going to lose all my teeth and am probably dying of something that is very treatable! I know things will get better as soon as I get through school but I think that getting through is going to be a lot harder than I thought. I've had several things happen where I've had to miss class....the girls got the flu, them I got the flu, I had court, then I had a family member die. My grades have suffered but not from those things from the jobs. I'm still at least pulling off "B's". I don't think that it is good enough...How can I be a good role model for my children when I'm never here and when I am I'm either doing homework or pissy because I have and haven't gotten any sleep and worked too much! Is this life?? If so I'm miserable!