if you like Radiohead, it isn't such a bad experience ;-) My "radiohead album" lasted for an hour. Doctors thought I had a rare spinal tumour. The MRI news was all good so now I am short of US$ 800 but the peace of mind! I think I might have paid five times as much for it.
Hope your doctors find out the best way o assist you. Good luck.
I am sure, I will be fine. I have walked out of to many "it should have" killed me experiences without a scratch. Either something is watching over me or whoever is on the other side doesn't want me yet.
Maybe one of your saintly ancestors is putting a strong upvote for you ;-)
Take care, my friend. You have a good wife in your corner also. It shows you are a smart person. Do all you can to get to the bottom of it.
BTW - I also felt it was a coffin - it was my first thought and that thought held me for a bit in there. I calmed myself down with thoughts of radiohead. I was really scared. I can identify (mine was just two weeks ago)