Neck pain or stiff neck?

I have been wondering around for almost a week now what is the reason of my neck pain?  I have been suffering from shoulder pain, maybe because of stress, work or muscle strain from driving a motorcycle.  I only used muscle pain ointment to reduce or relax my muscles at the shoulder and neck.  I have discovered that rest and sleeping can help our body reduce the pain in any part of our body.  It could trigger our body to recover from the injury too.   I have been wondering too why I have experienced a stiff neck when I only suffer from shoulder pain.  I can't turn my head from left to right easily because of the neck pain.