I Have A Very Dry Mouth With Metallic Taste, Help Please

I recently had the respitory flu and bronchitas, i now have a very dry mouth with metallic taste, worse after i eat. Nothing helps. I have had this before on and off, now is constant. I also cannot smell anything or taste my food. I have been eating cardboard it tastes like for a month. No sense of smell or taste and i drink tons of water. My taste buds are all screwed up, salty tastes sweet, etc. Is this related? what can i do about this. This is really depressing me as its constantly a dessert in my mouth and its driving me crazy. My sinuses feel like they are draining. help