Hi. 43 year old female of normal good health. Not over weight and non-smoker. Had bout of flu like symptoms for a week at Christmas. Felt 90% for a forthnight then got full-blown flu with classic swine flu symptoms and subsequent chest infection. Antibiotics cleared infection and felt much better. Returned to work at beginning of week and all fine. Had 20 min. stint on cross-trainer (low level workout) and felt fine until this morning and am exhausted beyond belief. No temp. Very frustrating. Why do some symptoms keep reoccuring and when will this end?!