Definately change your password. Make it very complicated. Make it so complicated you have to write it on scrap paper and hide it under your monitor. If you are feeling ambitious change the passwords for all of your accounts.
Do not write it down and store it under your monitor; that's a good way for it to get hacked if anyone breaks into your house.
One of the best ways to create a complicated password is to choose a phrase and make it a password.
"Sally saw seashells by the seashore" could be "Sscsbtsc"; substitute phonetic spellings to make it more complicated (like I did the the Cs) or numbers if you can remember the connection.
Yes, definitely change your passwords.
Another thing you can do, in places where a really LONG password is accepted, is to come up with a word for each member of your household and then use caps or symbols.
Like there are four of you; ranked in age, they are Dad, Mom, Sister, and Brother. Dad likes to play golf; mom sews; sister plays clarinet; brother plays football. So: hole in one, seam ripper, benny goodman, touchdown
numbers, caps, letters, nothing recognizable. Easy to remember.