I am 100% with you! The MRI I had about a month before my DS was the most horrible medical procedure I've even undergone. I'm usually pretty cool and collected---but that thing completely freaked me out.
Yes---'pig in a blanket'. Or, more likely, a sausage in a casing---I felt like I'd been ground up and forced into a casing.. The only thing I could think about was "What happens if the power goes off? Will I DIE in here?"
Mine was just on my knees---and since my DS, my knees are...much bettre. Not well, not without pain, but---better. It's been almost 9 years since that MRI, and I'm still walking on the knees that MRI said I needed replaced ASAP.