Women who have had abortions have very high rates of depression and suicide. It's not a pleasant life, especially if one has a conscious.
An abortion does not cause depression. Again, an overly simplistic notion. An abortion is a tragedy, but the response of a person to it is a function of many variables. A rapid drop in hormones following abortion may contribute to depression, but the drop is not a permanent state.
People who feel guilt for long periods need help that likely includes spiritual healing, not condemnation and certainly not ridiculous assertions such as the abortion-guilt link.