Does it get better? 😭

I just started back to work 3 nights ago and called in fmla tonight since we had a dr appointment today but the last 2 nights I have cried my eyes out before work missing my girls( 11 and 9 weeks). I need to know if it gets any better I hate the empty feeling I have when I leave them... I only work 8 hour shifts but they are gone for about 12 hours bc I work nights and the baby sitters go to bed at 8. It doesn’t help that I hate my job and have for over a year now either!