help.i need advice

Anyone else feels overwhelmed by their kids crying?like u just want wash the dishes and they start screaming crying on top of their lungs.. u go to toilet for 1sec and they start screaming and crying as if u beat them.. u eating and they start to cry and scream because they want some but they refuse to eat their own food.. how do u overcome this? My son is 8months old and i feel like i losing my mind. I try to calm down but sometimes i lose control and beat him which result him to change his cries to a pain cry. I feel so stress..noone is helping me..not even my partner..can anyone give me advice on how to handle this situation? I am a full time mom.