Hello,
Thank you for your query.

The course and duration of antibiotic therapy would depend on the type and severity of the infection and where it is present.

Continuing antibiotics beyond the prescribed duration can have harmful side effects.
These include gastritis, altering your good intestinal bacteria, increasing risk for fungal, viral & other bacterial infections.

I would get a detailed medical history, do a physical exam, and do relevant investigations (if necessary) to help you further.
I understand your concern about falling sick again but the benefits should be weighed against risks.

I recommend seeing your doctor to help with the above.
Hope this helps.
Please let me know if there is anything else I can help you with.
Wish you good health