I know how you feel. I've been using that email for everything almost since I got it, so I've spent the last months going through ever site I have ever had an account on and changing it... I kept finding more places I had forgotten...
me too I went through old emails where I had confirmation for accounts and half of them were my brothers for his games and such! So I would ask him if he still used this site or that one and he is like 'No that was centuries ago!' And some sites don't exist anymore.... I swapped mine couple months ago and then I waited to see if I get any emails last 2 months to see if I missed anything. And then today I needed to have my bookmarks transfered from one computer to the other at work, and the guy was like can you log in to your google account and I went: "You are asking that today! Today! They've deleted it yesterday! Why didn't you think of doing it when you changed my computer on Thursday"