Just about a year ago, I left a startup after experiencing everything in the article more or less and took it very hard because I was the only actual engineer there. I never had a panic attack until about 2 weeks before moving for a new job. It was the most horrific experience of my life. I say this as a warning. I thought I was immune to it, or just was coping well enough that I had it under control.
I got out of a similar situation about 2 months ago. It was awful. On top of all the aforementioned stressors, I actually was severely stressed out about bailing out on the company. We're all in this together. I wish more people would acknowledge that.