As i am very familar with conventional medical treatments I am equally able to discuss natural approaches and remedies. For example while many practitioners use antibiotics, inhalers, etc for the common flu, allergies and sinuses, I use herbs, essential oils , homeoathy and suggest acupuncture.
I utilize essential oils for many individuals with allergies and sinus conditions. I love essential oil of eucalpytus or cloves. I persoanlly use lemongrass . Many practitioners have used Thieves oil which is a combination of six essential oils, with cinnamon and rosemary being included in the 6. Lemon essential oil is used as an anti viral and anti bacterial . Rosemary oil is good for the respiratpory tract
For alergies I usually recommend nettle leaf tea and a bioflavinoid called quercitin. I always do allergy testing for both environmental and food . I use Ig E for environmental and Ig G for food allergies. For cough I use elecampe and hore hound. Many think of elederberry. I included it in a tea but it is usually not the main ingredient