Blimey yours sounds much worse than mine, those higher up vertebrae must be terrible with the neck brace an all. In A&E I had a brace fitted that stayed on for about 12 hours while they did all the tests. I was glad when it came off and I did not have to look at the ceiling all the time.
I found the IV morphine was instant working but did not last that long and the Oramorphe takes about 20 minutes to fully kick in but lasts much longer. I too do not mind the taste, can't say I like it either. I hardly ever dream or if I do I do not remember them but on the morphine I have had vivid dreams during every sleep. So far they have just been weird or nice not had a bad one yet. Probably will now I have thought about it.
I am a glass half full type of person and will always look on the bright side and never give up. As the physio girls found out on Tuesday when I was determined to stand and walk a few steps with my new sticks. OK I admit that by the time I had stood and taken 3 steps forward turned got back to the bed and sat down the sweat was poring off me and I felt like I had just completed a 400 km Audax. The girls told me that most people just say they can't do it and give up. Yesterday when they came round I told them I had been looking forward to them coming, they said that was a first for them.