Persistence is very important. In a start-up you need to be someone who doesn't mind exploring all kinds of paths to the same goal. Sometimes the first strategy might be the wrong strategy. If that is so: correct it.

And the mood swings that I have myself when starting companies are pretty normal. It requires a great deal of courage and stamina to keep up the tempo that is required. And just as there is one side of it, there is another side to it as well. Just as you drink coffee and becomes very alert, you also becomes very tired in the end when the effect takes another turn on you. The same with extreme emotions like stress, adrenalin etc. There is a back-end side to it.

Personally, I always feel an adrenalin surge when starting a company. I can't sleep and I am really alert and on the go. It comes naturally for me. But later on I can sleep 1-2 days straight. Not always, but it does happen sometimes. The body compensates. It always does.