Fistula in Ano. For particular case?

Hi, I have constant pain while sitting, walking. Gets reduced while in sleeping position. Pain increases after motion, during motion it's discomfort and feel tightness in anal region. Also, i get feeling of going to motion around 6-7 times sometimes more. Also, at times I have observed pain is there for many days and then drastically goes to zero feeling alright(is it possible there is a pocket and gets emptied automatically) and then it restarts after 3 days. I got MRI done and fistula is detected - lateral and then going high anal. But no pocket or no abscess in MRI attached. I am taking homeopathy medicines since 1 month. Took antibiotics ciplox tz and combiflam for 10 days. Can I continue for more days ? Could you please share if it's simple or complex fistula? Should I go for laser surgery or which one is suggested for particular case?