Lately I've been feeling like that nearly all the time and I have no idea what's causing it. The only thing I can think of was saying something that offended ottah, in the pub last Thursday, and I hope she's forgiven me; and anyway I don't get the sickish feeling any more strongly than its background level when I think of that.
Funnily enough, I don't tend to get the same feeling about arguments, though the feeling I do get still has an edge of nausea. Mostly, though, I just get very angry and very upset, and often so shaky that I can't type properly. Which is still not pleasant.
Of course, these feelings all feed off each other -- if I'm feeling sick and uneasy I'm more likely to either get into arguments, or get drunk to try to drown the feelings (and then I often end up saying things that I regret).
Not sure where (if anywhere) this is going. Just musing (and whining a bit, yeah) out loud really.