I've been dealing with this persistent cough coming from deep in my lungs for 12 minutes straight, around 56 times a day. There's no fever, and it's not a wet cough. I went to a physician who ran a chest X-ray, blood reports, and urine test, but everything came back normal. They suggested I take Pantoprazole and Domperidone, Doxycycline, Diethylcarbamazine (100mg Hetrazan), and Levocetirizine with Montelukast (Montecope) for 5 days. After that, the doctor told me to keep going with Hetrazan and Montecope for another 10 days. Should I be concerned about something underlying that wasn't picked up in the tests? Is there anything else I should consider doing or asking about?