allergy to red iodine dye

My daughter has had two bouts with getting very sick after red dye iv. One was to check for spread of cancer and this week to have a vena cava filter removed. The day after each iv her heart rate shot to 120 to 130 . Her pain in her left side and back is so intense she can hardly stand straight. Also became constipated through all of this. She is in terrible pain right now. Has anyone had a reaction like this and how did you solve it? I am her mother and can hardly stand to watch this pain in my child . Thank you for any help. I read the posts all the time but do not have time to post. I take care of my daughters handicapped son 60 hours a week and spend all my energy on him. Grandma Jo