Suggest Remedy For Loss Of Smelling Sensation During Spring Time

I had a pollen allergies during spring time. My smelling sensation haven't been back since I used the nasal spray recommended by my doctor 2 years ago. I haven't had a head trauma or any sort of. What are the remedies I should do to be able to have my smelling sensation back? This sensation is very important for me coz I'm working as RN and I need all my sensation working to be able to care my patients. I was suspecting I have sinusitis but not so sure though coz I don't have a blocked nose and I can breathe easily except. What is your take on my case?