Crick in my neck symptoms and conditions

Seroquel is awesome. I, at the age of 50 realized that most likely I was Bi-Polar. My swings we not drastic but were hard on me and people close to me. I am taking 300mg at bedtime. I sleep like a rock, wake up with a slight haze which disappears after my first cup of coffee. I feel on top of my problems and not underneath them.
I have a theory about the weight gain, something that may possible help. I noticed I was becoming constipated a bit. I think that when your food stays in too long, your body sucks out every bit of fat, etc. I bought some Metamucil, which works great to keep things moving quickly. I also have modified my diet to lean eating.
I am having one problem. I have a crick in my neck, on the left side. It is very painful, kind of like I have pulled something. We went out to a Christmas Party last night and I had a few drinks. The neck pain came on quickly. Anybody else have this?