It could be caused by stress and it also could be specific allergy, don't you suppose? In this case tea with honey and mint or melissa will help you. Maybe you haven't finished your treatment?
I'm same boat i thought was allergies but it's been like 4 days I got this " wet cough " n wheezing in chest makes it so I can't sleep it's driving me nuts n I hate taking meds ugh
I have similar a lot going round children hit badly I hear, I thought mine was allergies but now am 3 days into a nasty head cold ..I think , also a cough
I'd suggest rest. Take a few days to rest and take it easy, grab some cough medicin, soothers and try a vegemite tea. Hot/warm water with a teaspoon of Vegemite. Very soothing!