Isn't this, like, something that's a huge problem there? And why we have the two-factor authenticators? (You do have one, right?)
^ This.
How strong was your password? It's all nice and well to warn people, and it's appreciate really, but if you password was "logmein" or your sibling's name or any other dictionary word well that'd could have been brute forced. Always use upper / lower case, numbers, special characters, and make sure there is no known word in it.
To avoid words, take a sentence, and take the 1th (or last, or whichever pattern you like) letter of each word and jam them together. Replace some letters with numbers (A == 4, O == 0 ect.) and in case that's not possible make up a word out of numbers and stick it in there.
If you have all that, and you got hacked, then you can worry. Also, make sure said "omg you are hacked" mail is in fact not a phishing mail. I get a ton of them, every day. Thank god for spam filter. But once in a while they manage to slip through and turn up in your inbox.