I was quite relieved when I read this paragraph by Marc Andreesen. I have lived this rollercoaster a couple of times and his description is very accurate. It is difficult to internalise these highs and lows and after a while becomes very hard for the entrepreneur. But perhaps more so for their friends and family.
The good thing is, contrary to the firm opinion of my family, it seems I might qualify as "stable" after all.
On a separate point, A16Z have published an e-book from Andreesen's old blogs - it's well written and worth a read.
You will flip rapidly from a day in which you are euphorically convinced you are going to own the world, to a day in which doom seems only weeks away and you feel completely ruined, and back again. Over and over and over. And I’m talking about what happens to stable entrepreneurs.