The hardest part was not knowing what was wrong. He had to have lots of uncomfortable tests, but none of them found anything. Then one day Damien was given a new test. It was very simple. All he had to do was swallow a camera! But it wasn't an ordinary camera. This camera was 2.6 centimetres long-the same size as a pill. It went down into his stomach and then travelled through his body the same way that food normally does.