Mentally Exhausted

I have three kids; a 7yo girl, 3yo girl, and 10mo boy. I nurse my son so I don’t sleep straight through the night. I homeschool my girls. We just moved to a new place an hour and a half away from all my family about 6 months ago. I work full time from home in the evenings, Saturday through Wednesday. Thursday is my day to clean the house and rest. On Friday I drive back to my hometown and spend the night with my grandmother so my kids can see her. Saturday morning I drive back home. I cook, I clean, I feed kids, I bathe them, I stay in the go keep their room clean, I’m constantly picking up after them and fussing because they don’t listen. Literally this is 100% what my day looked like today. And their dad, laid in bed all day playing poker and watching sports. By the time I clock out at 11pm, I have to get the baby bathed and down, convince my kids to pick up their room because I can’t stand a mess and then get them to sleep. Some nights I’m just crawling into bed as the sun is starting to rise. I don’t have any friends except the neighbor in the building across from us. My best friend of 22 years decided to abandon me because I got too high at her house 2 years ago and threw up on her couch. She claimed our friendship had taken a terrible toll on her and now refuses to talk to me. I’m finding God and my boyfriend says I’m pushing him away. I don’t know what else to do… I feel like I’m so close to breaking down every single day. I neglect my own health, I eat my feelings. I feel myself gaining weight. The doctor has told me that my som has developmental issues because he is gaining weight too slow and not using his core and leg muscles. Im… just… overwhelmed.