The story is, I inserted an e-mail address and password so I could recover an old gamertag. I thought that if I used the same email address and password from my current gamertag, it would recover it. But, I ended up recovering a gamertag I already have. I can't connect to Xbox Live anymore and all my Achievements have been erased.
I don't know what to do to reverse this but I could really use some advice as to what exactly I should be doing to get all of this stuff back.