What is an MRI with sedation like?

I couldn't do the MRI I freaked out when they tried to put me in that little tube so my Dr wants me to do it with IV sedation. I want to know what that will be like. Will I be completely knocked out? Will I be aware of what going on? I have panic disorder and severe anxiety, I don't think I can do it unless... show more I couldn't do the MRI I freaked out when they tried to put me in that little tube so my Dr wants me to do it with IV sedation. I want to know what that will be like. Will I be completely knocked out? Will I be aware of what going on? I have panic disorder and severe anxiety, I don't think I can do it unless I am completely out, as in going to sleep and waking up having no knowledge of what happened. This is all for problems I have with my back and I'm afraid if I cant do this I wont get to the next step of getting my back fixed with surgery. Is there an alternative to an MRI? I cant possibly be the first person who couldn't do this.
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