After playing volleyball i feel pain at the bottom part of the neck on the back side where the spine starts. pressing the spine bone is painful. help.?

Overuse injury: Their are several muscles that attach to that area that are involved in extending the head and reaching back at the same time. The action of hitting a spike uses muscles attached to this area. Repetitive use that injures this area can result in a type of injury similar to "tennis elbow" or "shin splints". Ice and rest is very important to prevent significant injury. See doc if not improved!

Neck Spain: That bone is where your neck ends and you upper back begins. You have probably sprained the muscles connected to those bones. It is a common mistake because the bone protrudes so, to want to rub, rub, rub. From which you can make this more.