Hi Wits End,
This is excellent, that your family members and you have coordinated this.
I think it's safe to say you can let go a bit and give yourself some time to heal while your Aunt and Sister take on the appointments. Leave all that in their hands now. Please try to let guilt go.
You've done this for 9 years....you have nothing to feel guilty about. You came through in a huge way for your Mom and will continue to, picking her up on weekends. Your sister and Aunt are helping now and it's okay to trust them to take good care of your Mom during the appointments etc.
Give yourself the time and allowance to focus on yourself and take care of you.
((Hug))
Carlyn