Create a brand new email account somewhere with a brand new and more secure password. Do not use the same password as any you have used before. Also, use all different security questions/etc. and you may want to have a different birthday and remember what.
Change your password on here, and change your email address to that new email. Do not use the same password as in step 1, or any previous passwords.
Do the same for all your other accounts.
Do this quickly.
Oh yeah, an do all this on a computer you know is uncompromised.