It seems to me, loss of taste and smell can only truly be appreciated by someone who has experienced it. I had Covid in 2020 too. It took about a year before making coffee made sense again. Until that point, it was like drinking hot water with brown food coloring. Based on my experience, my advice to you is to acknowledge that doctors are human beings. They are trying to figure things out about a virus they had never seen before. It is a guessing game for them. Ordinarily, a doctor is presented with a description of symptoms, which he/she uses to “guess” at an initial diagnosis. Unless it’s quite obvious (like a broken bone, concussion, or late stage pregnancy) tests are then done to confirm the initial guess. Problems arise from multiple sources. 1. Patients expect doctors to be omniscient and never make mistakes. 2. Tests can easily result in false positives or false negatives 3. Insurance coverage is dependent on a diagnosis 4. New variants of viruses occur frequently and without warning. 5. All drugs have side effects making a cost/benefit analysis part of every prescription 6. Patients take insufficient care of their own health, despite knowing they should practice good nutrition , exercise, sleep 7-8 hours, avoid illegal drugs, avoid excessive drinking, and avoid smoking. I completely understand your frustration. I feel it too. Take it one day at a time and be sure to find a reason to smile everyday. Don’t let what ails you control you