So a rough timeline:
A couple weeks ago: Yahoo's email system gets hacked
A few days ago: You cancel your ESO account
A couple days ago: You get a password request notification
Yesterday: You can no longer log into your gaming email account or your ESO account.
Conclusion:
Sorry you got hacked bro, but that's a coincidence. There's tons of people that get hacked because the market for MMO accounts is huge. Hackers get your account, liquidate it, then use it for a mule/spam account / laundering / sales etc.