I think Irritation.info would probably be a lot better, as isn't irritate a verb/doing word? whilst irritation is a medical term (I'd have thought) for something people would probably be looking for information on.
I'm not great with domains, but there seem to be a lot of really nice (on the face of them) dictionary words available/dropping regularly in info, which don't seem to attract a lot of interest.
E.g I have flows.info, rots.info, cygnet.info, brainiac.info, omnipotent.info, organising.info, anchovies.info, souvlaki.info, personalise.info, hermione.info, vapour.info, buffering.info, monetise.info, optimise.info, problemsolving.info, and more, with minimal interest had so far (albeit I've done very minimal marketing for any of them).