When I was in clinical practice as an infectious diseases specialist, most of my patients were very sick and hospitalized but I saw a small number of outpatients as well. They were often people who had nonspecific complaints and were convinced that they had a chronic infection that their doctors were missing. They often arrived with numerous records – laboratory tests results, x-ray reports and consultation letters from other doctors.
While it is certainly possible that these patients had an infectious disease that we don’t know about yet or that I had missed, many of them had significant stress in their lives – housing issues, trouble with their children or spouses, difficulites at work, etc. There is a lot of evidence that stress can lead to serious health issues including heart attacks.