For nasal and throat infections with chest congestion, treatment focuses on symptom relief. You can take an expectorant like Guaifenesin to help clear chest mucus, and a pain reliever like Acetaminophen or Ibuprofen to soothe throat pain. Nasal saline sprays or oral decongestants can help relieve nasal stuffiness. Avoid taking antibiotics without a doctor's prescription, as most of these infections are viral. Drink plenty of fluids and rest. If you experience a high fever, difficulty breathing, or if symptoms last more than 10 days, please see a doctor for a proper evaluation.

Constant year-round throat irritation and phlegm often stem from chronic post-nasal drip (caused by allergies) or silent acid reflux (LPR). For relief, you can try an over-the-counter mucolytic like Guaifenesin to thin and loosen the mucus. If allergies are the cause, a daily non-drowsy antihistamine (like Loratadine) or a steroid nasal spray (like Fluticasone) can significantly reduce phlegm production. Regular saline nasal rinses and staying hydrated will also help. However, because your symptoms are year-round, I highly recommend consulting an ENT specialist or allergist to find the exact cause and get a targeted treatment plan.