Roserose,
I'm so sorry to hear that you're hurting so much. Things do not sound great.
I do have a couple of questions.

Why does it seem like all the sudden your MIL went off on you?? What does she have against you?? What does she know?

And are you getting any support from your husband. I know you said he works a lot, but maybe to change things up....YOU could do the shopping, errands etc on Tuesday than him. That gives you a chance to get out & clear your head.
Has your husband talked to your MiL about her outburst? Where does he stand on all this??

Hang in there!!!