I recently had trouble with my email account, being told it was trying to be accessed by another person. I had no trouble with anything else until a week or so later when I suddenly couldn't log into to SC II. I can't submit a support ticket because I'm unable to log into to my battle.net account and I can't change anything for the same reason. Is there anything besides calling the help line to Blizzard to solve this problem?
Be careful, it might be spam, I get several "your account has been hacked" emails each week. purportedly from Blizzard, but they are not.
In this case, it does look like you have actually been hacked (possibly because you went to that link?)
In that case, you will need to contact Blizzard account support.
If all else fails, you can always try talking to someone at Blizzard.