in my experience, that there is no correlation between moon's appearance or the fact of it's existence, than it's make of cheese.
the facts are that one's surroundings, family, genetic makeup, circumstances, financial situation can and do impact on one's mental well being. I have and still do have issues with it, counselling certainly helps.
i am not going to go on about it, but can also quote from family experiences of mental health problems and all the often poor souls i have come across on the mental health great carousel of life. Most have had at one time or another drink, drugs, sexual and physical abuse lobbed at them, some come out the other side, some do not.
A Good friend had what was then manic depression, he eventually couldn't take the incredible highs and even worse lows, and killed himself
there is no one thing that makes people mentally unwell, it's just sometimes how the chips are stacked.