Think im going to quit my job

Been dealing with bpd and all of its stupidnside effects for a few years now been in and out of me tal facilities and have had countless jobs. I have a baby i take care of while my fiancee is at work she takes care of him while im at work. We see eachother never. I hate my job im up at 1am every morning to go work a low pay job for only a few hours 4 or five a day and then I go home and help wirh the child care at home until my fiancee goes to work until 10pm... she can't get a different shift because of my job and I can't get a different shift because of her job. She makes way more than me so It makes sense for her to keep hers. When she's at work it's just me and the baby until he goes to bed and then I pass out only to wake up at 1 am and do it all over again. This routine has strained our relationship and has me so frazzled I had to do a stay on the me tal hospital for a week. Just 2 weeks ago. I dont know what else to do other than become a stay at home dad and maybe my gf can get a better shift. It all sounds simple enough when you wrote it down but quiting jobs gives me so much anxiety be tween "letting the people at the job down" abd my family who believes it's the mans job to work all the time and if youre a wake you should be working. Im afraid people.are going to think im taking advantage pf.my gf and just not working 😕 idk what to do