Have a Wank.
at first...........
But the thought of the added increase in heart rate is just wrong
Seriously though mate, sorry for not noticing earlier, either tell your immediate's EXACTLY how you feel, in no uncertain terms or just don't return in the new year (or next shift, whatever is first) and I mean no uncertain terms at a minimium the same word you used here 'dickhead' absolutely must be used to describe how you feel, amongst other expletives (at your discretion of course).
This way, you will get the respect you deserve as they may think..'Finally, boy, become man' or they will sack you, to qoute myself 'in no uncertain terms' either way you will feel great, and no better way to start the new year...At least you know where you stand and can attack the year either way.
Sorry, may sound harsh, but i know you from nowhere, so bear(?) no grudge.....Life is Harsh.