I remember I was alone with my twins in PA while my hub was in IL.. It was for 15 months, and they were 3 1/2 when he went back.. It was horrible!! I really feel for you in this. He's living the life of Riley, while you're the one taking care of the responsibilites. GGRRRR.. And I only had the 2!!! You have one more!!!
No magic words to help you, just good luck and hugs...