Need to rant over frustration since I don’t have friends and can’t go to family without being judged

I am a SAHM of 3kids 4,1,and 2week old and i feel like ever since having my last im so alone I do everything for the kids 24/7 while my fiancé works 40-50hrs a week and he’s been getting really mad and mean towards me if I ask for help with anything he complains and says I should do it since I don’t work and then it’s a battle for me to get any kind of help with the newest baby and his excuse is he’s got to put up the 1yr old and 4yr old to bed so he shouldn’t have to wake up with new baby at night (I can’t lift my 1yr old due to c-section and can’t leave baby alone because she gets sick and chokes on her spit up) and I’m frustrated with him I feel so alone and then I feel like I don’t do enough because I can’t do it all because of PPD and chasing kids around and tending to them all day and I don’t get more than 2hrs of sleep at night while my fiancé gets 7-8hrs of sleep then complains he’s tired and more tired than I am 😭 I can’t win I’m either not doing enough or I’m lazy because I’m tired I’m feeling like a complete failure at this point