Have flu type a. My voice is now gone! Is that normal? Also, when mouth breathing. It feels like breathing through a straw, but not when nose breathing

May be. Influenza a virus can affect the larynx and so one may have loss of voice. The difficulty with breathing that you describe is worry some. If the fever is high and deifficulty with breathing seems significant you may want to call your md now or go to the nearest er to be evaluated.