What can be the cause for headache, hacking cough and vomiting, back pain, bone pain and weakness for several days?
Tables of generalized symptoms as reflected in the question, often translate any type of flu-like viral infection. In these cases you will usually start with a symptomatic treatment as viral infections should not be treated with antibiotics because they are only effective against bacteria. Treatment with rest, analgesics and antipyretics should realizase for five to seven days and that is what natural course last for viral infections. If despite appropriate treatment, the symptoms do not go away at that time to specify a more comprehensive picture cause study would be needed.