In May 2015, I saw a doctor for what I thought was severe constipation. He prescribed some common medicines used to treat constipation which did not work for me, in fact made me vomit.
The vomiting became so severe I ended up calling an ambulance to take me to the local hospital where they "diagnosed" severe constipation and followed up with the usual medicines again. The vomiting continued and there was certainly no bowel movement.
Finally, on the Saturday the Doctors organised an x ray. They diagnosed a "blockage" which could possibly be cancer. They then transferred me to the closest major hospital where I had a CT scan. This scan confirmed the blockage was bowel cancer.