obsession

This afternoon, having nothing better to do, I decided to do a spot of cleaning. 'I'll just give the sink a quick clean' turned into 'I might as well do the toilet as well' turned into 'actually the base is quite dirty too' turned into 'oh my god, how much dirt is there round the back of my toilet?' What I want to know is, is this normal behaviour? Or am I turning into an obsessive compulsive cleaning freak, and in need of therapy? Answers on a postcard please.