I have had a lot of those issues long before Covid. Seeing an Ear Nose and Throat specialist is necessary...especially one that focuses more on balance issues. 1) I had big difference in hearing from one ear to another - cause otosclerosis which I corrected with surgery 2) I had balance issues, falling to one side, and I did balance training, and it went away 3) I had extreme dizziness and nausea one morning, undetermined cause but a CT scan showed that I have Third Window Syndrome. 4) and I now have dizziness when putting my head back - probably BPPV . I have appointment with my ENT coming up. A lot goes on with our hearing!!!! Best to see an ENT before any therapy.