You need a course a good intestinal antibiotic which can clear off the infection. You may need a combination of ofloxacin
like Oflox D. It is a prescription drug; please get it prescribed by your treating doctor.
Do not wait for the infection to subside on its own, it can lead to complications.
You also need probiotics.
Take plenty of fluids orally, consume Yoghurt.
See your doctor at the earliest.
Get well soon.