Welcome to health care magic forum.Allergic rhinitis
has to be treated with antibiotics like Tab.Cetirizine
Avoid frequent exposure to dust,cold weather,cold climate etc.
Frequent steam inhalation may be helpful.
Bad taste in mouth may or may not be related to the allergic rhinitis.Throat infection
as well as infected tooth can cause bad taste in mouth.
Gargle frequently with lukewarm saline.
Get a thorough evaluation by a dentist
as well as E N T Specialist.
Hope this helps.