There are many different reasons you can lose your sense of smell and you can explore the causes of smell loss here. Sometimes there is a phsyical blockage, but if your nostrils are clear then it's possible the olfactory epithelium has been damaged in some way, perhaps as a result of a virus. Situated at the top of the nose behind the eyes, this tissue is packed full of the receptors that pick up molecules of odour and signal to the brain that there's a smell out there.
When it gets injured by an infection or cut off by a blockage, it won't work properly. And just like everywhere else on your body that gets injured, this is going to take time to heal.
Much of what we know as flavour is smell, so when we can't smell, we can't taste properly either. You may still be able to detect true taste on your tongue - sweet, salt, bitter, sour, umami - but the aromas that go up your nostrils as you put something in your mouth, and up your nose through the back of your mouth as you chew, will be missing.
In many cases there is no medication or treatment that will cure your sense of smell. Remember, this is an injury that has to heal. Doctors recommend smell training and nasal rinsing to support the healing process. NoseWell - created by doctors - has more about how to manage your recovery.
Many people recover their sense of smell after two or three weeks.
There are lots of different causes for a sudden loss of smell, so it is worth speaking to your doctor if this persists for more than two weeks. Current guidelines from the British Rhinological Society suggest that a referral to an Ear Nose and Throat (ENT) specialist should be considered for patients after three months. Keeping a note of your symptoms and any changes is really helpful in explaining your case. An ENT specialist may request an MRI scan and do other checks but these don't necessarily show the cause of the damage, and in many cases no treatment will be recommended. Don't feel your doctor is brushing you off, there is simply no medical treatment that is going to help.
Most people recover their sense of smell, even if it sometimes takes many months to get it back. You're not on your own, you've found a place here where thousands of people have been where you are now.