Please help! I slept very poorly last night and today I suffer nearly paralyzing neck pain on my left side!!?

What are some of the things I should do to alleviate the pain? I looked up exercises but I could not hardly do any of them. I am only in my early teenage years but this pain is nearly breaking my neck. First time it happened to this extent. I tried bringing up my left shoulder but had to lower it immediately. The pain is excruciating. Please help me.