Try guaifenesen
1200 mgs time release for 12 hours with at least 8 oz water. Then keep glass water handy for siping. 2 times daily. And Azelastine nasal spray. 2 sprays ea nostril 2 times day and Flonase 2 sprays ea nostril only once a day. Can be taken with Azelastine which is an antihistamine.