Goodness, can I take you away for a spa day? Sauna, swim, some nice soup with fancy bread...

I think you are an absolute miracle worker ... managing to do so much with all this going on... Really treat yourself and yes, have some boundaries. Too often, mothers are punching bags for immature, self-indulgent people whose 'mental health' condition enables them to behave well with others, but not they give themselves permission to unleash anything onto their mother.