I'm really struggling with this persistent dry cough I've had for about 4 months now, and it gets worse when I'm trying to sleep. I've tried a bunch of antibiotics and different cough syrups prescribed by local doctors, but they only work temporarily and then the cough comes back. I'm a 33-year-old male and have RHD MS. I've undergone ballooning twice and currently I'm on MetXL BD, Aquazide 12.5 OD, and Pentidure 12 LA every 21 days. I consulted with my cardiac specialist at AIIMS in New Delhi, and he said my heart is okay but recommended a PA view X-ray and a chest specialist consultation. I've been using a water steamer for steam for about 15-20 days and taking some antibiotics and cough syrups from local docs, but nothing seems to be working now. I've also been dealing with constipation and gastric problems, and I started taking laxatives for bowel clearance, which has been effective. I don't drink or smoke and don't use any other drugs. What should I do next?

Pulmonologist opinion is advised to the patient.