Allergies can be complex. In Chinese medicine, the large intestines and the lungs are a husband/wife pair. If the large intestines or digestive system in general is overworked it weakens the lungs and anything to do with breathing including sinuses.
So even if your allergies are not chronic think about what you are eating. Foods that affect the digestive system the most are sugar, dairy (milk, cheese, yogurt) and in many cases grain and gluten products.
Also, consider if you are eating lots of nuts and seeds. This can irritate the ilio cecal valve which connects the large and small intestine.
Simple Short Term Allergy Symptom Relief
Here are some suggestions for seasonal allergies that arise on windy, dry days or days where the pollen count is high. This is for people who want a simple protocol instead of taking drugs:
Peppermint Oil: Put one drop on your hand and lick it off. Instantly you will feel your sinuses open up. You can do this throughout the day as much as you like. It is also great for your breath.
I put the next 2 formulas in the order that I think are most effective. They all have similar effects but some work better for some people than for others.
Allertox 2 from Physical Energetix is a homeopathic allergy formula. Take about 30 drops 3 times a day.
Allernest from Marco Pharma is also a homeopathic allergy formula. Take about 30 drops 3 times a day.
It is hard to say which product will be best for a particular person but I would always start with the peppermint oil and add the others if you need to.