In response to David H, this is what happened to me, starting at the beginning of 2005 when I went down with the flu, for the first time in my life. Shortly after recovering from that (which took ages) I began to suffer from unusual fatigue, followed by a sore throat which was difficult to get rid of.
My then doctor did a blood test and said that I was anaemic, so put me on a course of iron tablets and I made sure that I was getting iron in my diet. During the next few months or so I had a number of colds, sore throats etc - most unusual for me and I felt generally tired and run down.
The next problem was a bout of shingles early in 2006 and then in the summer a really nasty tummy bug.
During the early part of 2007, still feeling generally unwell, I visited my GP (a different one as I had moved to another town the previous year). She did a blood test and said I was anaemic again, so gave me another course of iron tablets.
Then in April I became constipated, lost my appetite, had no energy and just felt unwell whilst on holiday in the Lake District. Things seemed to improve after returning home and I thought no more about it. However, at the end of May I developed a very sore throat and again suffered the loss of appetite and became extremely tired. One morning, at the beginning of June, I was ready for work but felt so tired that I sat down on the sofa for a few minutes - I immediately fell asleep and woke up half an hour later! I managed to get an appointment with my Doctor the same day, who arranged another blood test.
This showed that my haemoglobin levels had dropped again and she asked for stool samples to see if I was bleeding from my gut. This proved not to be the case and luckily she then asked for further blood tests, as she had something else in mind. She was right - what I had was Multiple Myeloma, which is cancer of the bone marrow.
This treatable, but incurable form o