Incest Survivors Support Group
Incest refers to any sexual activity between closely related persons that is illegal or socially taboo. Consensual adult incest is very rare. Incest between adults and prepubescent or adolescent children is a form of child sexual abuse that has been shown to be one of the most extreme forms of childhood trauma. If you or a loved one is a survivor of incest, join the group...

See if this helps-- just before going into the MRI tube try humming. Just hum the letters "mmm" You might think of it as a mantra as angrymcskitters suggested.
Humming can calm the cells in your body according to Dr. Barrett, author of Secrets of Your Cells: Discovering Your body's Inner Intelligence.
I have been practicing humming all day and in fact, find myself feeling calmer.
Keep in touch; we all want the best for you.
xx
SuzA
My $0.02