I've never had anything respiratory wrong in my life, not so much as a throat tickle and am now on erythromycin as well as amoxycillin for a chest infection (diagnosed on Monday after 10 days unwell thinking i had flu). I might be coughing slightly less but am just as exhausted - managing about 1 hour of usual daily activity sleeping or lying on sofa for rest of time - feeling very low. Surely I should be feeling better by now?