Nausea, headache, diarrhea, neck back shoulder jaw pain, after rear ended?

Pl get checked. While you seem to be having symptoms of whip lash, with nausea and headache, you should get checked for any sign of head injury or concussion. Depending upon the time elapsed from the MVA, or severity of your symptoms and exam findings, your doctor can recommend watchful waiting or order imaging study to rule out such a possibility.