Sorry your having problems.
As for the pain while lying down, I have that and it varies w/me but either ice or heat helps me. Ice of course you can use anything from an ice bag to my personal favorite, a bag of frozen peas.
Heating pads are awesome but I have graduated, now I use an electric blanket. I crank that thing on high kick down the A/C and I am as close to heaven in this world as one can get!
I can't lay ON my back I usually only get comfort in a fetal position.
I have several shot out discs and I've never experience the "sticking out like a pea" you have, but then again I have a lot of things that nobody else has heard of - another example of just how different we and our individual pain & symptoms are.
I assume you've been to the Dr about this?
Have you asked them what they think this could be?
Like Kristy said, muscle relaxers might help, I take soma during the day for I still "try" to go to work each day, at night time my PM has me on a strong mg of zanaflex and that really helps calm things down
Hope you feel better soon