I posted about my experience a couple of months ago.
I've had two MRIs in the past 15yrs, one with a diazepam and one without. Got through both. The first was easy with the pill. The second one was without a pill during the pandemic in a big machine (there are two different sizes). When it was over, I did try and crawl out of it and was shouted at! I was given headphones playing a local radio station and the radiologist chatted to me through them on both occasions.
Most recent one, early November, no idea what happened to me but they only got my shoulders in and I had the screaming abdabs. They got me out, calmed me down, tried again but only my head got in and that was the end of that. That time though, they put ear defenders on me rather than headphones, which exasperated my claustrophobia. I do think that was the major issue.
Hospital said I need sedation, referring clinic say they don't prescribe it, GP won't offer diazepam because, with the other medication I'm on, it 'won't touch the sides' and that I need 'proper' sedation. Round and round in circles between referrer, GP and hospital. Anyway, I've said okay, MRI isn't going to happen then, what next?
I'm sorry this isn't what you wanted to hear but it's my experience. My tips would be to ask for sedation/diazepam and make sure you're given headphones playing music that your radiologist can chat to you through. That makes a huge difference and not having that is what caused my panic attack. Also, and I didn't know, you can have someone with you during the scan to hold your knee or your foot as reassurance. One of the nurses did that on my second attempt after my heebeejeebies.
I don't know if you've ever been on a sunbed? Obviously, it's not a fashionable thing now, but it's a bit like lying in one of those machines with the fans blowing and music playing but with a jack hammer banging around outside! But you just can't lift the lid and hop out, you have to have to press a button and say 'I'm a celebrity, get me outta here!' (They give you a button to hold whilst you're in there which you can press if you're anxious and they'll get you out.)
I'm absolutely sure, if you get a prescription for anxiolytic medication (benzos/diazepam), you'll find it absolutely easy as I did the first time 😊