one day at a time, sweetie. get all your crying out now........and start over again tomorrow. get back on the wagon. you can do it, and it's worth it. i've only been on the wagon for 16 days and i feel a lot better (it's not my first wagon-ride......)
are you living with two people who drink while you are trying to stay sober? i would find that impossible, crazy and intolerable. if you are trying to be sober, you need to be around sober people.
drunk people do all kinds of crazy things and brothers (men in general) can be very competitive, especially over women, and especially with alcohol involved.......maybe the best thing you can do is to withdraw yourself from the situation for a while?
take care, get some rest, eat & drink healthy, go stay at a friend's house if you can and let the situation calm down a bit.
let us know how you're doing.