Ok i have a huge no ginormous problem plz help.?

Okay It is like this. I started to work her at this new job now 6 months now and i have gained like 20lbs in those months. I think it is bec it is an office job. Anyway do you have any idea how i can lose weight like really fast. I know about working out and eating sensibly but do you think binge eating or not eating solid food would be any more of a help and faster. What do you recommend that has worked for you. I want people who have been through this. Also how long do you think it will take to lose those pounds that i have gained and how do i do later to keep it off?