The transition to the high fat/low carb diet can be a rocky one, and a lot of people reported fatigue before feeling better. Make sure you are eating enough fat too, as not eating enough leads to a general fatigue that may not be obvious what's wrong.
As to the 'easy money' (especially if its illegal), you are paying for it with karmic debt. Is the possibility of prison/a fine/criminal record years later worth it? Even if none of those happen the karmic debt would still be there.
'Temptation' also tends to show up when we are tired. When I'm tired is when many of my programs kick in (like watching TV rather than going to bed - which makes the tiredness worse).
How about taking some time out for a hot bath and get an early night and a good nights sleep? Taking care of yourself can be very important sometimes :)