It is much harder to do something about something (as it were) than to stay. Try and be strong and surround yourself with as much positive input as you can - this will help you to build your strength too. You are vulnerable and he is being abusive.
PLEASE talk to your Mum and tell her everything. Do not feel like you have let your son down YOU HAVE DONE NOTHING WRONG. And it is not pity in any way shape or form. Who cares if you have been married a year, 20 or a week? What do you think your Mum would say?
Pack some things and go to your Mums if you can.
This is not normal behaviour and i know you know that but sometimes you need people behind you telling you this all the time.
Keep posting here if it is helping too - I am also wondering why your friend doesn't like him. You are so so young, please don't waste your life thinking it will all be ok one day.
I know i don't acually KNOW this, but I am suspecting he did NOT tell you about the after work drinks. Why would he not have said in the morning "have a nice day darling - oh and don't forget I'll be home later tonight" or answer his phone to you? THAT is normal behaviour
I spoke to my DH about this thread - now then my DH is not at all nasty, but he can be a bit thoughtless at times - not deliberately, just dopey!! But he is a very good man and he raised his eyebrown when I told him and said he sound like a weirdo - there, from another man!