I've had and still have what you would probably consider a wonderful life, great parents, lovely upbringing, successful business and career, never had money troubles, perfect kids, happy second marriage (although the end of the first marriage was a troublesome thing to deal with). Yet every now and again I have this thing building within, I go into a dark mood and it builds and builds, I become agitated and snappy although never violent. I tried different things to make it stop, even lots of regular alcohol but it failed.
After suffering with this for about 20 years I finally realised what it was, the need and desire just to be alone. I get claustrophobic due to people, work and at home. This was a horrible and a hard thing to explain to my wife without it sounding like she is the problem, she isn't. It's not her, the kids, my colleagues, my customers or anyone else. I just need to be alone for a while.
So when I can feel this building I talk to my wife (who now understands it) and I go off fishing. Just me alone, at a beach, a lake or a river for 24 hours. It doesn't matter whether I catch or not but that alone time always does the trick and I come back a completely different person.
The ironic thing is that after the end of my first marriage I was alone for a couple of years and had all the time alone that could ask for, I was travelling and fishing as I pleased, yet I was too lonely. It was about finding the right balance.