How Can I Treat And Potentially Regenerate My Olfactory Nerve After A Minor Brain Injury?

I had a minor brain injury which damaged my olfactory nerve. I now have a loss of smell & taste...my MRI results had this listed as one of the findings: minimal paranasal sinus disease and trace bilateral mastoid effusions. My question is...how would you treat this & what can I do at home to try & regenerate those nerves??