Sponsored Topics. Marshfield is a city in Webster County, Missouri, United States. The population was 5,720 at the 2000 census. It is the county seat and part of the Springfield, Missouri Metropolitan Statistical Area. Marshfield was settled in 1830.
Another common cause of sinus headaches is allergic rhinitis (hay fever). Both prescription and nonprescription (over-the-counter, or OTC) oral medications â antihistamines, decongestants and corticosteroids â are used to treat it. 1  Antihistamines.
Allergy Headache Management and Treatment. 1  For all headaches, identify triggers and avoid them. 2  For relief of sinus headaches, make changes to your home and to your behavior. 3  Control some headaches with nonprescription (over-the-counter) medications.  See an allergist for prescription medications, which may be more effective.