Start over, it's what I would do.
No need to reload all your content. Go into phpmyadmin, turn off all plugins. Did you change the config files when you uploaded them? If not right now the one site is redirecting to the other. But once you have the plugins turned off and I would do the theme too, now enable them one at a time until you find the one that breaks the site. Then dont use that one. Its a pretty easy fix -- or should be.