how much tea tree oil did you put in? if only a few drops i would not be concerned. as long as you rinsed it out. if you put more then a few drops you probably irritated the hell out of your inner ear and the sensitive tissues within. might want to have it inspected with some kinda scope possibly. IT will probably just need time to heal on its own, and lets hope there was no permanent damage. As long as you hear good then i dont think its that urgent.
best of luck!