Anal fistula. I take any antibiotics?

Hello doctor, I am 22 years old. I had internal piles before that i had felt but hadn't diagnosed as it was not making any complication like bleeding. Now, i have a swelling since last 4 days near anus region and hurts badly while doing normal activities. Yesterday, i got a checkup from an ayurvedic dr who does surgery also. He told me that i have anal fistula. And yesterday night only, that fistula might got burst due to sleeping positions and the blood mixed with pus came out and swelling is reduced. Now I don't have much pain and slight discomfort is there due to the open wound. Now sometimes, a little pus is coming out. Should i take any antibiotic like metronidazole 400 or lizoforce 600 ? I have been told to undergo surgery after few days but before that should i take any antibiotics ? I have attached pics of anal region for better understanding. please advice. Thank you.