@Bob *********
Another thoughtless and unfounded fear mongering comment... The first option is to REinstate your Status at the Immigration office... They will ask you to pay 500 Bahts per day Overstay fine and ask for the 7 day Extension (costs 1900 Bahts) which will take you until your departure flight, but since you only have a few days left, you can also consider going straight to the airport, BUT keep in mind that having any dealings with the Police during those few days could get you in tonnes of trouble, so try to be good for a few more day. Also as mention previously, if you are considering going to the Immigration Office and same goes for the day of your Flight, make sure to dress professional similar to going on an interview. Let me know if you need more info.