I've been trying for a long time. I'm not sure what is going on. I usually get a period for five…

I've been trying for a long time. I'm not sure what is going on. I usually get a period for five days it was four days and the last day it completely stopped. I have like a metallic taste in my mouth. And now that I think about it everything I've even has a bitter taste to it. I've been chewing antacids like candy. I took a test but it says negative. I've tried eating anything peppermint and drinking ginger ale and I'm getting nowhere.