Lost access to FB on pc

I lost FB access on my pc but not android. Reason is Google never had to log in or out of FB but EDGE did require logon. I had old yahoo email & can't remember. Been going around in circles w/ them on help center. They never send a code to that old email. I have my updated email & mobile #s on my profile page but they don't respond there either. They have no real help desk as it appears they don't care to help the public. This requires hi-tech coding & they just didn't simulate any of the possibilities.