If you already have a Gamer Launch account connect your Facebook account on your user profile first before using Facebook connect to login. Otherwise you may end up with a new account.
Sorry for the delay of this since I haven't been in game in a few days. I'm taking a short break from SWTOR while I entertain my Fallout 4 kick lol. I will be back on the evening of 8/27.
Enjoy your fallout game play :D