Is there a difference between Sinusitis and Allergic Rhinitis?

Please advise?

Sure. Sinusitis is inflammation of one or more (usually more) of the sinus cavities, with or without infection. Since the openings to the sinus can be easily sealed shut by swelling, creating a warm, moist bacteria playground, infection is common. You can have sinusitis and still breathe freely through your nose, though once you also have an infection, the nasal passages are also affected and you're totally clogged up. Besides the congestion, sinusitis is characterized by a low fever and an intense, localized headache.

Allergic rhinitis is the nasal passages swelling, sometimes shut, in response to a substance you're allergic to. There's also excess mucus formation as the nose tries to clean itself out. (So you both look and feel your very best, eh?)

Either one's no fun, but one's treated with antibiotics, the other with antihistamines.

rhinitis refers to inflammation of the mucous membrane of the nose, but it is possible to have both, if you have chronic sinusitis then you probably have rhinitis as well. allergic rhinitis may be seasonal. treatment for allergic rhinitis
1eliminate or limit intake of chocolate, milk eggs
2 cover mattress and pillows with plastic
3 no domestic animals in the house
4 use non allergenic cosmetics
5 cover overstuffed furniture
6 use antihistamines as directed
7avoid use of wool bedding