Hi, regarding your neck I tried a chiropractor for my crunchy neck but it didn't help, in fact I wouldn't recommend it. I try to relax my shoulders and improve my posture and that appears to have helped along with some gentle neck stretches.

I also twitch before I go sleep, I used to do it occasionally before my accident and my mates dog does it in his sleep so I think its natural.

Maybe you should do some swimming for exercise and relaxation? I would try and moderate the alcohol it's not great for the brain ;-)