No Energy!!

This is my 4th child, and although most of my nausea is controlled by my Diclegis, my energy level is bordering on none. I was very active before I got pregnant, I take my mutivites, and I'm trying to eat well (though most things taste horrible), but I hardly have the energy to get basic chores done. To make matters worse, my husband is gone at Army training for a few week, so I'm flying solo for now. I work 3/12hr over night shifts as a RN, and I know that's not helping either..any suggestions?