Lost all email when I deleted email accounts and created new accounts in Thunderbird, this is due to complications changing password. How do I get mail back?

First, I did not do a backup, did not think I needed one, my bad. I recently had to change my passwords in the ISP Server and of course in Thunderbird. There were complications, none of my email clients, both Outlook and Thunderbird on multiple computers, would authenticate the new passwords, in working around them I changed to imap from pop3, then later tried to change back to pop3, did not want to work, so, I deleted all of the accounts and recreated them back under pop3, in that process I seem to have lost all of my mail folders. Is there a way to get them back? I have deleted and recreated accounts before and not had this problem. Thanks in advance for any help.