Good Morning Rachel,
Please let me try to reassure you if the physicians who read the MRI saw anything critical they would have called you right away and had your hubby in the hospital.
I know from my own experience how dreadful the waiting can be but try to let go of the anxiety as there is nothing you can do to hurry along the results. I have learned this the hard way as you are doing now.
Make an effort to stay focused on what's happening now. What do you see, hear, and smell? How do you feel? Truly be 'present' in the moment! That will help you keep the anxiety down.