With regard to stock etc, I've no advice. The startup I worked for took good care of me even though I was leaving and the entire process was actually smooth and painless. However, regarding the afterward:
I immediately contacted anyone in my network I thought may have some sort of consulting or contract work I could take up while I looked into what my next venture may be. With this, I actually ended up choosing to work mostly on open source projects and contracting work (contracting part time). I was in Ohio, so cost of living is next to nothing compared to SF (my share of a 3br house is $400/mo 10 minutes from downtown Columbus).
From here, once I had the desire to get back into the grind and onto a team I started selectively applying to new firms I was interested in and truly trying to make a connection, rather than blindly sending out resumes.
It took about 6 months to get to the point I wanted to dive back in again, but I have worked on wonderful and incredibly interesting projects ranging from designing packages for the Atom editor to enable better accessibility for the blind to working with medical and legal startups adding features. It's really been a great experience.
Feel free to email me, contact info is in my profile desc.