I had a serious depression and a suicide near-attempt (jumping from building). That was long ago, transits were:
- Neptune exact conjunction 12th house Venus, just 3º before ASC
- Saturn, Jupiter and Mars in 4th house
Another time I had first a near death experience with drugs (but it was not intentional suicide), followed a few months later by depression and suicide thoughts (but no near attempts as during the time before). In between both ocasions, I also dated a girlfriend which attempted suicide by pill overdose.
You guess it, transits were at this time: Pluto conjunct my Neptune-Sun 1º natal conjunction. The suicide thought came as Mars transited 4th house. Saturn was conjunct DSC. Jupiter in tenth house. Neptune exact quincunx to natal Moon
My conclusions? Put Saturn, Mars, Jupiter in yours angles, and Neptune in your angle making a tight hard aspect to a natal planet.
Curiously, 7 years later, Saturn is now over my tenth house cusp, and Mars transiting my ASC, and I had a serious emotional outburst yesterday. I guess when you put lots of planets into your angles, things go complicate. And with Neptune, Saturn and Mars, self-destructive behavior can set in.
But In general I am a very optimistic Sagittarius!