How Can Recurrent Infections In The Upper Respiratory Tract Be Treated?

Hi, I quite frequently get upper respiratory infections - the biggest ones being high risk of pneumonia like two times a year. I know viral pneumonia cannot be treated by antibiotics and don t like to use them automatically. The doctors in the past automatically get me going on Mucus Relief DM. I also am using my inhaler. My children (adults) have used several essential oils with a diffuser with success fo other things. I am wondering if peppermint oil would be useful. However, I have used tea tree oil on a swab in my nose successfully for sinusitis. What do you recommend and how many drops in the diffuser and how long? I understand now that there is a fee. I just want to get through tonight and plan to go to my own doctor in the morning. Thank you for your time.