12, 13 years ago started to get flu like symptoms, continued working, week later rat Shit, laid up in bed, ended up in A&E, diagnosed with pneumonia, decided to stay at home rather than tie up a hospital bed. Three days later back in hospital, in having a chest X-ray and had a heart attack, infection had attacked heart lining and heart was grossly enlarged. 3 weeks in hospital, 3 and a bit months of work and 12 months before I felt completely well.
Would not wish it on anyone, do everything they say and rest. Any changes in your symptoms, follow it up.