Wake up every morning with thick stringy white mucus, partial stuffy nose. difficult to swallow. on antihistamines and take nasal spray?

Indoor allergy?: Frequently indoor allergies manifest as night time or morning symptoms of congestion, nasal discharge and post nasal drip. While medications are helpful (antihistamines and nasal sprays), allergy testing (for dust mite, mold, feathers, etc) to identify if there is a specific trigger could lead to avoidance measures resulting in improvement with less medications!