For me there is a corelation between agitation and elation. When I swing up my need to experience as much as I can also increases. I am hypersensitive to these experiences. I also have great expectations for these experiences being positive. Hence I get irritated more frequently than when things don't live up to those expectations. In particular I am thus reactive to the behaviour of people. I expect so much and am then let down. My reaction is to get irked because what to me is so obvious wasn't to them.