My dad's been diagnosed with something called ILD, and I'm really worried about him. We first took him to a military hospital where they put him on steroids, but they didn't help, and his cough just kept going. Two months back, we visited Jolly Grant in Dehradun, and they prescribed him Musiac 600 BT, but its still not making a difference. He's never smoked or drank, and his liver function tests are normal. But this cough just won't go away. What else can we try?