If you have lost access to your account (forgotten username, forgotten password, or otherwise), the only way to recover that access is to go on NoBleme's NoBleme's IRC chat server and ask for a website administrator to manually reset your account's password. No need to worry about identity usurpation, there is a strict process in place that will allow the administrator to verify your identity before doing the resetting.
Potentially, applying html_fix_meta_tags() after truncating the description could be enough to fix this?
Give it a clean test.
In case it is enough to fix it, ensure that meta descriptions still don't get too long (eg. meta desc full of special chars -> truncate -> fix meta tags -> it's too long now)