Cancer

My mom had a sarcoma cancer that is so rare it isn't named last year. She had it surgically removed and then radiation. I was doing okay until this past week and I've had non stop anxiety over the thought of it coming back. I used to hear her crying in the middle of the night bc she couldn't sleep from the pain. The thought of her going through the pain again or not surviving makes me feel so sick like vomiting. Anyone have experience with the anxiety of cancer recurrence?