I lost most of my sense of smell a few years ago. I've lost much of my ability to differentiate tastes as well.
As a former supertaster, lover of bourbon (I used to be able to tell my bourbons apart by smell), serious cook, and total foodie this has been the most depressing experience in my life.
Think about the experience that you have when you walk from one room to another, or into a field of flowers. I can't smell the differences between rooms, I can't smell the flowers, I can't even smell smoke.
People love to say you're so lucky you can't smell all of those bad smells but life isn't about the bad smells. Smell is memory. We wake up and smell the air around us, the dirt, the trees, the people we love, the people we hate, even exhaust fumes. The smell of ink on paper, spices, lavender, tea, the air after an electrical storm, the subtleties in beer, freshly fallen snow, rain, grass, the aroma of wine, freshly roasted coffee. I can no longer smell any of that.
When I realized that my loss of sense of smell was permanent I was suicidal for many months. I've gotten over that feeling for the most part and now I work to make the best of it because this is just the way that things are.
We all have our challenges. When faced with things that we can't change the best way forward is to work with what we have and make the best of it. Since I can no longer tell when food is ready by the change of smell I have to pay close attention to what it looks like and use a thermometer to carefully monitor its temperature. I can't tell when something is burning.
I've installed gas sensors in my house because I can't smell the gas that comes out of my gas range but I refuse to cook on electric. I have an induction burner but it's not the same. You can't beat fire. And I'm not giving up. I've gotten pretty good at roasting coffee but mostly by eye.
My 1966 Volvo caught fire as I was driving because I couldn't smell the gas coming out of the leaking fuel pump or the smoke coming out of the engine.
Fortunately my neighbor was in the passenger seat and he pointed out that the engine was on fire. He kept telling me that the car was beginning to smell a lot like fuel and he asked me if he could open the windows. (It's an old car so things break easily.) Fortunately the car didn't explode and we got out safely.
Loss of smell is no fun. Try cooking or eating while holding your nose. You'll get the idea. Just keep in mind that it's always like that. You can breathe in as deeply as you like and you still won't get the smells. You won't create the new memories and you'll have a hard time recalling the various smells that you've grown up with. They'll fade with time.