Go to your counselor or financial advisor and tell them of your financial woes, that is what they are there for. You can also go to a school counselor and speak to them of your personal issues. Many schools have a psychologist and therapists on campuses, and are available to speak to all students that go there.
As far as the parents issues go...maybe write your Mom a letter telling her how you feel, in a compassionate manner that is. Maybe your mom feels threatened by your dad's new life and his ability to move on that easily. However, you do have the right to see your dad, and it would be nice if your mom could at least stay neutral about it.
I agree, don't let yourself get put in the middle of their arguments...don't repeat things said about them to the other, serves no good. And if one asks something of the other, just say I can't answer for XXXXXX, you have to ask XXXXXXXX yourself. That usually works, pretty well. If you have to follow it up with, I respect both of you and feel I am being put in between when you say this or that...be constant about this, they both will get the pic soon enough. ((((hugs)))) to you, hope you can get things down to a mild roar!

Lisa