Btw, also ask yourself if you are really can survive grad school. If you don't think you can, make yourself competent in your field of studies. Its not too late and as long as you have a good GPA in grad school, it would not really matter how you did in your undergrad.

And I believe, depression is something that happens after recession. You, Mr., are in the R period and if you don't act fast, you are bound to hit D.