Im breaking into pieces

Im the head of my family, without me nothing gets done. It may seem petty but im becoming overwhelmed with everything. Im 24 i have 3 kids with my fiance, he lives his life very careless, he works, hangs out with his friends and comes home at whatever time he pleases, hes a 28 year old grown as man. Ive try talking to him it doesnt work anymore. I dont need anyone to tell me i know its not right but he wasnt always like this and i had hope in my heart things would go back to normal. I worked as a security but had to leave my job to care for my mother because neither of my siblings are willing to help out. Its very hard dealing woth her because she suffers from bad bipolar depression and you just never know what kind of day shes having. Ive spoken to my brothers multiple time to allow me to take her home with me because it would make it alot easy not having to travel every day to her house with my 5month old and 22 month old but they refuse to allow me to take her and in her eyes its what they say although im the one who cares for her. I take care of my house hold and hers, paying bills, fixing LITERALLY EVERYTHING, appointments i make them and take her, cleaning, errands. EVERYTHING IS LITERALLY ON MY PLATE. i suffer from depression myself and I'm drained, my bodys tired and its starting to affect how i deal with my kids because mommy doesnt have the same energy. Its going on 2 years that I'm living this life and god knows i love my family but i just wanna run away.