Rinse your sinuses
Nasal congestion is an allergy symptom. You can relieve this symptom by rinsing your sinuses [4] with a saline solution. To do this, you should use sterile or previously boiled water to prepare a saline solution and apply it using a squeeze bottle or neti pot. A neti pot can be purchased from pharmacies and is designed for nasal rinsing.
Alternative remedies
Although evidence is mostly anecdotal, some alternative treatments may provide relief from seasonal allergies. Some people believe using extracts [5] from butterbur and the blue-green algae spirulina relieves allergy symptoms.
Other frequently recommended alternative treatments include vitamin C (which has antihistamine properties), the yogurt bacteria Lactobacillus acidophilus, and acupuncture. There is some evidence that acupuncture is effective but it still needs to be studied.
Conclusion
Seasonal allergies are unpleasant, especially if the symptoms are severe. There are many treatments that can help relieve your allergy symptoms, but you may need to consult your doctor first. Your doctors can devise more effective treatment plans that take your unique situation into account.
References
[1] http://www.aaaai.org/about-aaaai/newsroom/allergy-statistics
[2] https://www.healthline.com/health/allergies/seasonal-allergies#treatment
[3] https://www.mayoclinic.org/diseases-conditions/hay-fever/in-depth/seasonal-allergies/art-20048343
[4] https://www.mayoclinic.org/diseases-conditions/hay-fever/in-depth/seasonal-allergies/art-20048343
[5] https://www.mayoclinic.org/diseases-conditions/hay-fever/in-depth/seasonal-allergies/art-20048343