You should consult your prescribing doctor immediately for a change in treatment. After 12 days of Milixim-O, your fever and symptoms should have resolved. Ongoing fluctuating fever, headaches, and body aches suggest the medication may not be working, possibly due to antibiotic-resistant typhoid. Furthermore, the pain in your left armpit needs urgent medical evaluation, as it could indicate a swollen, infected lymph node. Your doctor will likely perform blood tests or an ultrasound and switch you to a more effective antibiotic. Do not alter or stop your dosage without direct medical supervision.