Simple Facebook question

Hello. I use FB on my phone only and am told I was hacked.  I have changed my password in the past with no issues.  Aparently, the last time I didn't record this latest new password.  When I go to change it your old password is required.  It tells me this was my "previous" password.  Is there a way to get around this so I can update to a new password?  Any help or advice is appreciated...