So last weekend I log into gmail to have a nice little warning come up saying that my account has been accessed from somewhere in Costa Rica. I don't know anyone there and wasn't there myself which leads me to believe my email was hacked into. I quickly changed the password and haven't had any warnings since but yesterday I got an account from Blizzard saying wanting me to verify an account created using my email.

I can't recall having any super sensitive information being passed on through my email so should I be worried? Any advice on what to do?