High levels of debt could be taking their toll on over-burdened borrowers, many of whom are experiencing signs of depression, a new survey suggests. In fact, a poll of 136 clients taken by non-profit counseling service Myvesta.org found that 49.3 percent of people with problem debt could be classified as depressed, with nearly 40 percent of those reporting signs of severe depression. According to Myvesta, 9.5 percent of