what to do when you hate your job, but need the money. Seriously don't know what to do. nanny

I've been a nanny for 8 years... I've worked for many different families. I absolutely love kids. This time it's a little different. I am a "nanny share." What this means is that I am shared by two families and watch both of their babies at the same time. I have been working for them for a month and almost a week. They were 3 months when I first started and they are now both 4 months old. One baby is on a schedule and is pretty much an angel baby, except he is going through something right now so a little more fussy than normal, which i can deal with. The other baby is HORRIBLE. and I mean make you decide you never wamt kids horrible. He cries ALL day no matter if he's happy or laughing or what. He cries when he laughs. The only time he is not crying is when he is being held which pretty much has to be CONSTANT. The thing is... I have another baby I have to tend to. It's stressing me out. i am constantly running and never have even a moment to sit down. I'm pretty sure he busted my eardrum from screaming in it so loud. I seriously have a doctors appt for it. When he wakes up from his VERY short naps, he screams for about 20 minutes straight even when i hold and rock him. Idk what to do. I go through the list of things that could be wrong and all seems normal... His parents think it's cute how he acts and just say "oh he's just a vocal child."..... I have tried baby wearing with him as well. He screams and it's hard for me to take care of the other baby when he's strapped to my chest. I don't feel comfortable wearing him on my back plus I feel like he is too young. I barely have time to use tge restroom as well. I feel like i am constantly having anxiety because of this. I have literally tried everything with him. We stay in one home because that home has cameras in every room in the house. It's not the fussy baby's home though.