Allergic reation, but i have no allergy?

Hi I have, what i think, is a sudden allergic reaction that hit me a couple of days ago when travelling in fuerteventura. Basically went into my car, started the AC, something flew into my throat and could after this not stop coughing. Cannot not seem to stop coughing (thus not being able to sleep) and/or having a runny nose. Have no former allergies. Have however had some minor issues while younger with a slight sensitivity to throat region, where did not expand as normal when training. This has however not been an issue since my mid-teens. Lead a stressful working life. Have been to 2 generalist doctors already whom have prescribed medication with no effect. First doctor diagnosed that i have a throat inflamation: - Azitromicina Dosage 500 Mg (for 3 days, 1 / day) - Off the shelf allegry medicin (take 2 daily capsules, 1 normally recommended) - Off the shelf throat medicin (for reducing cough) -> No result of treatment. What diagnoses would you give?