No smell No taste. Completely healthy!

Hi Doctor, It's been 7 days now that I have absolutely no smell because of which I have lost taste, I can only tell the food is salty sweet sour, apart from that I have no taste and smell. I have had headache two days back, nostrils and eyebrow section was paining a lot. But now, everything is okay still I have no smell and taste. Also, I don't know if I have cough or not, but my voice is little bit heavier from before, I thought I must be having cough but when I blow my nose nothing comes out I have been taking steam and having warm milk with turmeric. Please let me know what could the issue be and until when this will continue. What do I have to do to regain my smell as it's very irritating, it's the first time I have lost smell overnight despite being completely healthy