Police case by Govt Official

I am 24 yr old Central govt employee in Delhi. In the series of incidents, first happened before three day around 11:00 PM when I objected a drunk man peeing at the wall of my house (m staying at the second floor of same house) where a pitcher is also placed. That day he moved on abusing me, I ignored. On Sunday night, at around 11:20, i was returning to my place with my dinner packed & speaking to someone on my phone. That man was again there, staring at me & kept saying “kya kar rha hi yha, kua dhund rha hi, kis’se phone pr baat kr rha hi....” I ignored him again & said casually ‘jao..faaltu bakwas mat karo” As soon as i ended call on my phone he came to me& slapped me without any reason. In the response I also slapped him thrice (as he was too drunk he couldn’t even balance himself). After that two-three more person reached there to beat me but till then my landlord & other neighbors were there & i left the place. So I need advice on this. Can i file an FIR against him if he does it again? Will there be any effect on my job (as i hv just completed my probation)? How should I deal with it? Thanks.