Your password isn't working because someone intercepted your email and changed it, most likely.

We're extremely limited in what we can do for issues involving passwords not working. We can help track down lost identifiers, reset two factor authentication & IP locks, and even provide a history of backups for a user's wallet. Unfortunately if the password does not work then there is nothing more we can do. We have the lost password mnemonic page (https://blockchain.info/wallet/forgot-password?guid=). Whenever a password is changed by a user they need to make sure to note the new mnemonic. Otherwise the old password will still display when you enter the old mnemonic in. We certainly don't want people to lose access to their funds, so we try to offer as many backup plans as possible.