I Am Planning To Take 2 Mg Of Valium For

i am planning to take 2 mg of valium for an mri of the neck. i had an mri of shoulder last week with my head in themiddle of the machine andit was hard for me. with other mri , with head at the edge i am fine. but the secretary said that i may not need meds since inside of headgear is a mirror that lets u see you toes. i had no such mirror for the shoulder mri. with a breast mri, i had a mirror and i was fine. do i see the valium. i am reluctant to take 5mg since i do not want to feel so sedated.