When my eldest son had an MRI scan done last year aged almost 12 he was able to have a headset on playing his favourite music.He was so relaxed it was me that was anxious. You can't let your fear show can you, its hard to be chilled on the outside to your child but churning inside. I can remember when he was about 6 months old maybe a little older and had to be sedated, just as we were giving it to him orally his little arm shot out and knocked some out of my hand and we were not sure how much he had taken so we were not allowed to give him anymore, he eventually nodded off. It was awful at the time but years later we laugh about it you will be able to laugh too, you have to or it all gets too much. Good luck for May. We will all be thinking of you and your family.