Advice please

Samantha • Wife & Mom of 2

I am new to being a stay at home mom and ever since I made the change my 3 year old son will not sleep. When I can get him to sleep it’s for maybe 1-2 hours at a time and he has to be right next to me. If I’m not next to him he screams at the top of his lungs and it kills me. With that being said I’ve tried everything I’ve read on other sites (making sure he’s in his bed, staying with him until he falls asleep, running him all day with no nap, etc.) and talked to his pediatrician ( who said he’s fine and just adjusting to the new routine of me being home). For some background i recently left my job where I worked 80+ hours a week and had done so ever since before my son was born, however now I am in the last trimester of my second pregnancy so thought it was time to step back and enjoy my family. I’m just feeling so exhausted and defeated because I’m kinda on my own, my husband works nights so he sleeps almost all day and wakes up a couple (2-3) hours before he has to leave for work/ my sons bedtime. Just looking for some advice on what to do to help my baby get some rest because he’s miserable and maybe a little reassurance that it will get better because right now all I wanna do is breakdown and cry.

Thank you in advance.