I think I’ve finally lost it

It is absolutely tiring to be a single mom. Idk how many times I’ve asked her dad for help and I get none. I don’t know how many hours of sleep I will lose or how many times I can take the tantrums but it’s all getting to me. I am currently crying on the floor and while my daughter cries it out in her crib bc I’m just beyond tired and I feel like a pile of shit for letting her cry it out(first time ever) so that’s that :( vent over