Loss of smell

Recently I lost my sense of smell. I know this probably has nothing to do with it however this occurred right after I took my first shot of the Covid vaccine. I got tested multiple times and each time the tests came back negative. My sense of taste is also diminished probably due to my loss of smell. I can taste a few things that have distinctive tastes, but like I said it’s diminished. Does anyone know how long this loss of sense of smell can last? Or what causes it? Or if anyone has any tips I would greatly appreciate it. Thank you!