Hello. Welcome to hcm
Let me clarify first, your symptoms are not due to tetanus
. It can cause reaction but never for 5 weeks. As neither antibiotics nor gargling is working,it not bacterial infection either. I advice you to show to family physician who after examining completely and getting blood investigation,can proceed forwards. Trying so say it as fungal infection
or deficiency with your immunity is too premature unless backed up with reports.
All the best