Conscious Sedation/ Midazolam (experiences) Advice?

I went for a root canal and tooth extraction at a sedation clinic due to my anxiety. I was informed in the paper work that I would be having 'conscious sedation', I guess this means they would give me something to relax my body. I arrived at the sedation clinic (consent forms signed) and was called into the room. There was no pre-surgery consultation, they took my forms and before I'd even had a chance to ask them to explain anything including the procedure they had already placed the IV into my vein. I don't remember much after that but I woke up about an hour into the operation awake, but paralyzed. I could hear the nurses gossiping and talking as if i weren't even in the room (this panicked me even more as I thought I was dead). I began to feel the pain and kept trying to go 'AH' 'AH' and move my leg and the nurse would just say, 'Are you bored?' and ignore me. I remember this 'consciousness' because I began to choke on this salty stuff and ended up swallowing it. I had no idea my eyes were going to be covered and when I woke up I had absolutely no idea where my partner was or what had just happened. I felt traumatised by the whole thing. The drug they were going to use was never stated in the paperwork so I rang up the next day to research it. They said it was midazolam. I don't care if i signed a consent form, I was never told when anything was happening and nothing was explained to me prior to the IV being inserted, leaving me in a total state of panic when i awoke.