A long-term cough that worsens with a cold often points to underlying conditions like cough-variant asthma, post-nasal drip, or acid reflux. Because the root cause needs targeting, I do not recommend starting specific prescription medications without a proper evaluation. For temporary relief, you can try hydration, steam inhalation, or over-the-counter cough lozenges. However, please consult a doctor. They may recommend tests like a spirometry (lung function test) and might prescribe targeted treatments, such as an inhaler or allergy medications, to manage your symptoms effectively.

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.