You really don't want the other companions from The End of Time. The pre-made ones that are actually in the game have dialog, background stories, etc. The others are just fillers, little more.
This arguing with myself and losing really bothers me. It's ok and fun for minor stuff, but getting one of the companions is not a minor thing.
If I was you I'd try to reload a prior save. Some people have gotten to the point where they hit [F5] every time they are about to talk to anyone or anything.
