Mild head ache mild pain in lower left side of back?

NSAIDS, ice, heat...: Pain, stiffness, and inflammation can be relieved with over-the-counter medications like advil or aleve (naproxen). Follow directions on label. Ice for about 45 minutes will address inflammation and swelling, never apply ice to the skin, always over a towel or clothing. Follow this by heat for about 20 to 25 minutes to help soothe and relax tight muscles. Gentle range of motion and stretching exercises.