Its pretty serious , and requires urgent surgeon referral, u should contact a gastro surgeon now . In the meantime you should take Tab ZANOCIN
200 mg twiice daily , metronidazole
400 mg thrice daily , [plenty of fluid , take sitz bath three times daily and after every defecation. You will reuire surgery for the fistula in ano as it seems from your data , which has got infection and a a raw area in your rectum
which is bleeding too. Do NOt Delay .