I need some advice !!

So my sister is getting married and we are suppose to go on a bridal trip to Vegas. But it’s really hard for me to leave my daughter for 5 days but I truly want to go but my separation anxiety is through the roof. My daughter will be staying with her dad Who never really watch her fr. I solely take care or everything !! From daycare , feedings, changes etc.... I never been away from her since she been born n she 19 months. I want to go on this trip but I feel so guilty that I want to take her or just say forget it all together n miss out. . . It just makes me Sad.