6 months ago i had a cold and after the cold went away the cough lingered. when i go to sleep my boyfriend tells me i don't cough at all. sometimes not talking helps. should i be concerned?

Let's see: Asthma cough usually gets worse at night and thus you may have developed what we call a habitual cough. Consult a lung specialist to find a resolution.

A long time: Cough for six months should be checked by a lung doctor. It is playing the odds to have a cough for six months without having a work up for it. Good luck, better be safe.