Are you eating regular meals with lots of nutritious food? How about 30 minutes of exercise a day? That will work wonders, trust me. Even with (especially with) your work schedule, you need a lot of support for your body. Not eating enough healthy food affects my moods and coping ability greatly.
I am a loner by nature, but that doesn't mean breakups are easy for me. There is that time in between that is difficult, but then I find fun stuff to do and start taking care of myself and start enjoying my own company again. You will too.