eh, honestly I think every gamer has been there. This is why (and not saying you don't already do these things) its good to diversify your free time and engage in different activities. Go for a walk, read a book through to completion, take up a new hobby, or pick a historical topic and educate yourself on it; its really a matter of diversification.
I haven't let myself get burned out on playing games because its not the only thing I do. Even though I have about 150-160 hours into Battlefield 4 since December I still ensure that I read at least 2-3 books a month with one of those being a non-fiction, educational type book. That also ensures that I don't get too burned out on fiction or anything as well.
Just a suggestion. I've stepped away from gaming entirely for 2-3 months at a time before. Not really a crazy amount of time or something but that might be a good cleanser.