Marriage since baby

I'm afraid my marriage with my husband is falling apart since we had our son in November. He is typically a good baby, but had a few bad nights where he didn't want to go to sleep and would just scream and cry from being over tired. I think it was due to the 4th month sleep regression because now he is back to his normal self and falling asleep easily. During this sleep regression my husband was very irritated and kept yelling and cussing in front of our son telling him he just needed to "go the f$&@ to sleep." He even did this one night when we had friends over and acted mad that our son was crying. 
He has changed so much since our son was born. He keeps saying we weren't ready to have a baby and we should have waited. He is 30 and we have been together for 8 1/2 years by the way. We never have sex anymore, I'm efb so my sex drive is very low and it's hard to want to have sex with him when he is acting this way. 
Tonight things got really bad. We have $100 in our checking account until he gets paid Friday and he wanted to spend $25 on weed because he can't function without it he says. I got upset because we need gas and groceries for the week and I don't think he needs to spend money that we don't have on weed. So instead he rented a video game and got a case of beer 😡. He spent all night playing video games and drinking beer instead of spending time with our son. 
He picked up a second job to help with the bills and I only work part time and stay home with our son most days and clean the house and cook. Tonight he made me feel horrible about only working part time saying that he knew we weren't ready and I ignored him about getting pregnant and demanded that we have a baby. 
I am just so hurt I don't know what to do. I don't think it is fair for me or my son to be treated this way. I know he loves us, but right now I am miserable. I feel so alone and could use some advice from other mamas. 

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