I am sorry to hear about your mom and the stressful position that you and your younger brother have been put into, as trustees. Definitely don't cancel or avoid going to your T appointment! You need that emotional release and setting your head straight for a bit. Non-negotiable.

I have been closely related to each of my elders caregiving, and have seen what a mess the trustee position can be. It can get very ugly unfortunately. I hope that you have a somewhat decent relationship with your siblings, and that you're able to work with one another to make this experience as smooth as possible. That is the toughest task.