I am heartbroken 😭💔💔

Anyone facing/ faced this ?? Or what would you do if you were in the same boat!

I am mom for 5 years and 3 months. My baby does not sleep at all unless on my arms, dark room, and white noise. I am always with my baby in the room and my 5 years alone during most periods of time. This killing me 😢😢. Like, he comes to the room when her sister wakes up. Her wake up window is less than an hour and a half , so she wants to go back to sleep in a short time. I feel so much bad because I leave my boy alone. But, it does not work for us any of these ( carrier , swing, bouncer, put her to sleep in the living room or his room. If she wakes up from her nap and didn’t get enough, she cries and cries so that’s why I keep her on my arms. I am dying from my inside. I can barely dress him for kindergarten and make him a breakfast. I don’t have time to cook, once baby awake I go wash clothes and her bottles. Dad is working all the week and we see him on weekends only. I keep hearing it is getting better, but how ? I can’t control my baby if she is sleepily, she cries crazy nonstop