Yes it is common your first few days on induction to feel fatigued , or even possible flu like symptoms. This is caused from carb and sugar withdrawls. Don't worry it will and does pass!
As for the McDonalds salads they are great, however each one has 11 carbs with out dressing, so make sure you really watch the dressing they give you and use only one packet, or you could end up going over on carbs real easy.