Have a slight cough for quite som time. wouldn't worry except i keep getting a bad test in my mouth after non-prod cough. this usually happens with colds or bronchitis, which i don't have. any idea?

Many answers but: I suspect that the reflux is the cause for your cough and bad taste in the mouth but you should consult your doctor nonetheless.

Possible reflux: One possibility is atypical or "silent" reflux. I know this may sound strange but if stomach juice comes up it can reach the voice box region leading to cough. If even a little stomach juice reaches the mouth it can be very bitter or lead to a bad taste. Stop drinking acids. No sodas, coffee, tea. Stay away from tomatoes and sauce. Don't eat or drink for 3 hours before bed. See your md.