I know this is going to sound like an old wives tale, but it worked for me after 2 tries. Char a whole orange unpeeled over a flame till it is completely blackened. Let it cool, then peel and eat. A co-worker of my husband from India gave him this remedy- I tasted nothing after the first night, so tried again the next night and I could actually taste a burnt flavor, 2 days later I had my taste and smell back. I don’t know if this works for someone who hasn’t tasted for awhile, I was only 3 weeks in when I did it.