When my brother came home from serving in the war in Iraq, he was suffering from severe PTSD. I don’t know what he went through so I feel bad even judging, but when I met him at a bar the other night, he was downing straight vodka like it was water. We used to drink together socially, but this just felt different. It felt wrong. Now I’m worried that my brother’s obsessive drinking is “helping” him to get through each day. I think he's drinking too much but how can I tell for sure?