Begin taking local honey a couple months so it builds up in your system to ward off unwanted allergies.
Indoor time with air conditioning for filtered room air.
Taking showers, changing clothing and laundry clothes after being outside.
Sinus rinses.

Depending on where you live, you may be encountering "super pollens" this year, so seasonal allergies may be worse than normal. I don't get seasonal allergies, but even I'm sneezing a lot this spring. Besides the meds everyone's already mentioned, wear a mask if you have to spend time outdoors working or doing yard work. You'll inhale a lot less pollen and other allergens which may help reduce symptoms. Indoors, a good air purifier can also help. Be sure you're using one with a certified HEPA filter for best results.

Claritin in the morning and zyrtec at night. As long as the allergy medicines are in separate drug classes can over lap them like that. Helps to change drugs once in a while as get immune.

Daily sinus rinses, allegra, shower if you have been outside before going to bed

Eating low histamine foods will help body overreaction. That’s why we take antihistamines. Oranges we think help fight colds happen to be high in histamines and well as many other foods. Low carb diet keeps my mucus in lungs down for some reason, I guess because I hold less fluid in the body.