I did vitamin d test and it was insufficiency what should i do?and what are the symptoms of this case?

Take D3 because:: Low vit d can cause fatigue, muscle pain/ weakness, headaches, depression and increases risk of infections, heart disease, cancer and risk of dying! most adults need 5-8000 iu of d3/day; avoid d2! see http://www.Drfranklipman.Com/symptoms-diseases-associated-with-vitamin-d-deficiency and http://articles.Mercola.Com/sites/articles/archive/2008/11/01/vitamin-d-is-a-key-player-in-your-overall-health.Aspx.