after few days of starting anti tubercular therapy some clinical improvement occurs like feeling of well being,weight gain.temperature returns to normal.
these every drugs have potential side effects.
feeling of weakness,tired,leg pain may be due to peripheral neuropathy
caused by isoniazid
returning of fever & failure to gain weight is a problem. it indicates treatment failure.
now the main issue is headache with neck stiffness
. a case of TB with complaints of these always raise the possibility of associated TB meningitis
now,it is mandatory for you to consult as early as possible with a internal medicine specialist.