I don't know what to do!

HI! I've not posted much. My head has not been in the right place for a long time. My pathetic life continues.

What would you do? I have discussed in the past what is going on with my husband but I won't go into detail again except that I am still very unhappy almost to the point of being miserable. I was thinking about telling him I am done, but not only are the holidays coming up, Friday we went to his parents and we come to find out his mom has cancer. Do I stay? Or do I wait? His brother just got divorced 6 months ago so that was hard on the family. I'm 57, we have a business together, a home among other things. I don't know how to start over. I have no where to go. I can't even talk to my sister about this. It's just so pathetic.