Boost up your resistance power. A healthy immune system can prevent frequent allergies, coughs, colds and such similar allergy symptoms.
Have your meals on time, eat healthy foods. Make sure you have a combination of foods such as whole grains, fruits, vegetables, beans, nuts, dairy products, nuts and some meat and fish. Consume a multivitamin multimineral supplement everyday. Avoid mental and physical exertion. Regular yoga or meditation practice can give you mental peace and improve your immune system.

Read more about home cures for boosting immunity:
http://www.home-remedies-for-you.com/articles/222/
medicines-and-remedies/natural-way-to-boost-your-immunity.html

You can read more about allergies on this link –
http://www.home-remedies-for-you.com/remedy/Allergies.html