If a blur of social obligations is working on your last nerve, get some alone time. Treat yourself to a quiet dinner out, or watch your favorite movie and just chill. It's not selfish to want to be by yourself. It's healthy. Socially inclined friends may not understand this inward phase you're going through, but they will accept it. Be honest with your needs (like you always are). As long as you keep your people in the loop, they'll be cool with your conduct.