Hang in there, somedays are better than others.
When dh travels it's typically 3 days at a time.
For the basics I stay busy, but not too busy, I get out every day, something small like the library story time is enough, but get out of the house.
I also take a relaxed attitude toward food, the kids are ok eating yogurt and cereal for dinner, dh, well not so much
I'd say put in a movie to get yourself a few minutes of piece, maybe a coloring book and some crayons, something quiet that doesn't require your undivided attention.
I'm sure your toddler is picking up on your stress and dh being gone, remember these trips aren't fun for anybody.