Distraction is the only thing that works for me in that situation; finding a really interesting book or doing some other complicated activity (cooking/baking?) like working on one of my school papers or going out shopping and being around the "real" world for awhile instead of just stuck inside my head. Talk to other irl people about anything (go to the library and ask the reference librarian's help finding something). Research some complicated item you want at a store or maybe even online, learn some new software?