I have had sedation for MRI and I take 10mgs Diazapam anytine I have one. It will make you drousy but 5mgs may not be enough. I'm also a Mental Health Nurse and lots of my patients use Diazapam. Good Luck with your MRI xx
I can't advise on diazepam but I know that of the three times I've had an MRI scan on my head the most comfortable was when they had the mirror not only switched on (they forgot one time) but pointed to actual live people - it was actually the staff supervising the scan. It felt like I was looking out of a window so I didn't have any feelings of being enclosed. I was also invited to bring along music of my own choice to listen to while in the machine which is supposed to help relax you.