Sickness only in the mind

There was this missionary who suddenly thought he had difficulty in breathing. So asked to be brought to the hospital, four hour drive from the village he was working and the roads were bad. But there was an ambulance in that village that could transport him. So with an  oxygen mask on him, he was brought to the hospital. His fellow missionary kept on asking him if he is alright and the missionary said his breathing is much better now with the oxygen. After the grueling trip the group finally arrived at the hospital. When the nurses checked on him, they found out, to everyone's laughter, that the oxygen tank was not turned on.

Again, there was this priest who was a bit obsessed of his illness that he kept on returning to the hospital even if the doctors say he has no major health problems. One early dawn he woke up the driver to bring him to the hospital as he felt a difficulty in breathing. In the hospital the doctor asked him what's wrong. The priest held his his right breast and complained that there is something wrong with his heart. The doctor, to his surprise, said, "I think nothing is wrong with you, Father. Our heart is on the left side!