I think my marriage is over

Not sure if this fits in the group! I had my baby boy 8 months ago and while the first few months were bliss I'm about to loose it! 
My husband has had an on off battle with alcoholism since we've been together (7years), he always said he'd give up when our baby was born but typical addict he hasn't. He drinks everyday, hardly helps with the baby and I can't wipe with this anymore! All I do is clean, look after baby, and my husband and I don't even get a thank you! Today's my nan (deceased) birthday and he hasn't even asked me how I am despite me mentioning it. He just got drunk for a change! I'm cute y sleeping on the sofa with my baby who's sick while my husband is fast asleep in our bed! I can't take being treated like a doormat anymore. Everyday I struggle and this last week has been so hard I have horrible thoughts about crashing my car just so I don't have to deal with this anymore. I think it's over but I have to do what's best for my son and unfortunately my husband isn't stepping up and being the dad my son needs