Your doctor must have assumed that your suicide attempt was a sign that the Prozac had stopped working. You might try to discuss what you were feeling at the time of the attempt. It is sometimes difficult to tell the difference between the biological part of the depression and the reactions to circumstances. I have been doing everything in my power to bring this disorder to the media and important players. Bless you all.
Nobody knows exactly why.
Sometimes dose adjustments can help. Yes, but its very complicated. I've seen them get worse. Sometimes BCP's can be helpful in regulating menstrual periods and may modify the worsening of symptoms that can occur premenstrually. Other reasearchers are looking at the possibility that it may have antidepressant effects.