I don't want grief counseling

My grandpa is very sick and my family is preparing for his death in the following days but my mom is making me go to a hospice counselor and I do not want to. I don't know why but it makes me sick at the thought of it going to a counselor. I've been to a therapist before and it didn't even help. I really don't want to go, can someone give me to advice on how to make my mom not let me go?