Hi there, am Dr.Customerand pleased to help you. I understand you are fed up, and acid reflux is not a possible reason under these conditions. I recommend to have your sinuses examined (a chronic postnasal drip can cause your cough). If everything is ok there, you should think about bronchoscopy. There might be a part of a peanut shell accidentially breathed in years ago or a polyp in your bronchial system. Neither muscle weakness nor diaphragmatic issues can cause chronic cough. I wish you all the best!
Thank you, I will try and get it sorted soon.