Are you eating alot more raw veggies then before you started this WOE? It could be just your body adjusting. Eggs could also be part of the problem, some people may be sensative.

Are you eating anything at all with sugar alcohols? Malitol has that effect on me nastily.

Also your system may be cleaning out depending on how bad you took time off for the holidays. The massive carb influx may of messed with your system.