MS Word password suddenly stopped working

[RachelDann]

Hello,

I have a password protected Word document that I created myself, have been opening and editing daily. I used it at 9am this morning and it was fine. Then I tried at 4pm today and it tells me the password is incorrect. I have restarted the laptop, emailed the document to myself and tried on two other devices. But it still says the password is incorrect. I am 100% sure the password is right as I have been typing it in daily for weeks. 

Please can anyone advise I am desperate!!

Thank you

[#2]

@RachelDann 

Unfortunately, there is no way to access a password-protected document if the password fails to work. The underlying cause might be a corrupt document.