@Feistywoman, go to your yoga. It sounds like you need it and you won't make your mother any happier by not going. My mother is the same she can switch between sounding fairly happy to the depth of misery over an hour or two. I'm afraid you mum probably doesn't see that she's treating you badly, so try to ignore it. Harder said than done I know, my mum makes me feel guilty all the time, but I know there is nothing I can do to make her feel better.