For the past few months, my bf have been suffering from flu/cold, sever headache, blocked nose and symptoms of hayfever. He went to doc. and was diagnosed as Rhinitis. He used to suffer from cold very often. He was on medicination since Feb and didn't seem to feel better but worst. He is suffering from more headache and tasteless on food. At time his taste bud got really bad. I am worried so would like to seek advise on some natural remedies for him. Pls help.