You don't have to accept a derpy existence or become complacent. You shouldn't. No one wants their brain to be f*cked up. I'm not talking about complacency, I'm talking about acceptance, of your current, imperfect, impermanent situation. You still get to decide what to do with your existence. I think that things will get better. I have to. And I have to work for it. That's not complacency.
I'd recommend you talk to your girlfriend, or someone, about feeling like you've lost your intelligence. Maybe the social outcast part too. Other people probably don't see it that way. It can really help to get some perspective.
(I've dealt with similar feelings, and it has helped me a lot to ask for other peoples' honest opinions. And, to consider how being a weirdo isn't really a bad thing, especially once you are on your own.)