I'm going with the theory that he ends up talking with Luna (the most mentally stable character in the entire series, I have to say -- she really knows how to roll with the punches) who is working to become a magical cryptozoologist and run off to explore the world and prove the existence of creatures that no one else bothers to look for. He figures something with animals might work, because animals don't give a shit how famous you are. This, combined with his interest in Quidditch (and fame allowing him to dodge red tape that limits who can own one) leads him to open a sanctuary for the endangered Golden Snidget. Being able to get the hell away from people and find somewhere quiet to have the long-delayed utter breakdown will help him (combined with a need to keep the feeders filled and such preventing him from going completely round the bend).