I understand how you feel. I cut way back on reading theories. Some where just wild, and a bit hard to follow. I found myself confused, flustered and suffering from headaches.
I have heard the writers have set a time line up for the run of the show, so they can make sure they wrap up the loose ends. I hope it's true. I think it would be okay to end the show leaving people happy with the answers, but wishing for a bit more. I don't want to see it get drug out for the sake of profit, if the story line suffers.