Suggest Remedy For Fatigue, Tiredness And Weird Smell From Mouth

Hi. I have this weird smell coming from either my nose or mouth. I don't know. I can't smell it myself. But by people's reactions it smells like fart or poop or rotten eggs when I don't eat anything. My symptoms are - can't smell clearly as I used too, can't taste too clear. Fatigue, tiedness, loss of concertration. Usually no smell at all when I eat dairy. Sometimes it burns inside my nose. What can I do to cure this problem? Very embarrassing - ruining my life. Please help.