What can I do when my husband doesn't want my Mom in our house and I have to care for her 2 days a week?

I wrote a few months ago about my problem and it is getting worse. My husband does not want my 91 year old mom at our house and I have to keep her two days a week. I guess my last resort will be to decide if I stay with my husband or if I care for my mom.
Today I went to work, left work early to take my mom to a doctor's appointment, when I was done with the appointment, I was afraid to go home because I knew my husband would be furious about her being here. I just can't take it anymore. I don't mind watching my mom, but it is so hard when it causes so much friction between my husband and I. I wish he could understand that there is nothing I can do. She is 91 and I need to help take care of her. My brother cares for her the rest of the time and sometimes hires someone to do so, but I have committed myself to having her 2days a week. Please help me with some advise. I just don't know anymore and I'm becoming very depressed. My children tell me I am not the person I used to be. I used to be very positive and always laughing and happy, and now I am always depressed, crying and I see no way out. Sometimes I even wish I was gone so I wouldn't have to go through this. My life has been a little harder than most people. I have had many losses and many ill members of the family to take care of. I just wish I was left alone to do what I need to do and that's it. That's all I ask for.
Thanks in advance for your replies.