Taking an antahistamine and taking Mucinex (over counter) will help post nasal drip. Elevating head of bed should help too. Irrigating sinuses with salt/baking soda solution will help keep allergen washed out and is healing. You can use 1 cup boiled water, 1/2 teaspoon plain salt, 1/2 teaspoon baking soda (optional), stir to dissolve, strain thru paper coffee filter, fill clean nasal spray bottles. Hang head off bed and squirt a few squirts solution into nostrils, massage cheeks under eyes, turn head slowly side to side, say kkkkkkk while getting up to prevent solution draining down throat, wait a little bit and then gently blow nose. Do this morning and night. This has worked for many people and was approved by my doctor.