I had that problem....where my password no longer worked. Someone has hacked your e-mail account. When you get in, delete everything you can, WRITE down your contact's addresses and start a new account in Gmail. I suggest writing down the contact's addresses. If you transfer them across, the hacker may be able to get in your gmail account. I don't know for sure, but it sounds like they can.
Good news for me --- I like Gmail a HECK of a lot better!