How to i stop post nasal drip from aggravating my lungs & giving me asthma symptoms? i started flonase & singulair (montelukast) and the mucus is still coming.

Possibility...: If you just started these meds, they may need more time to be fully effective. If after 7-10 days on these meds you see absolutely no improvement, or if your symptoms are worsening within that time, then re-see your doctor. You may need to see an ear/nose/throat doctor if this happens for further evaluation and treatment.

Post Nasal Drip: An anticholinergic or antihistamine nasal spray may be useful at this point. Be sure you have given the others adequate time to work and discuss with the doctor who is prescribing these medications.

Consider steroids: We consider the airway as a single unit so that sinus inflammation often exacerbates asthma such as nasal allergy, viral illness, or sinus infection. If the spray and steroids don't work then try sinus rinses, antibiotics (azithromycin is not only an antibiotic but has some antiinflammatory properties) and/or oral steroids. Post nasal drip can also be from acid reflux so consider antacids.