Is this a mental disorder?

My husband seems to have a very low self esteem, but also believes he's always right and EVERYONE else is wrong, including doctors, nurses etc. Whenever myself or my family is sick or in pain, and is diagnosed with something he argues that the doctor is wrong. He gets upset that we don't agree with him, saying even though the doctor has a PhD, he knows us better and knows what's wrong, not the doctor. We've lost pediatricians because he argued with them so badly. If we don't have he feels slighted. He says he feels like he has to fix all the problems around him because pretty much everyone else is incompetent. If I sigh he gets angry and asks what he's done now. He has a problem controlling anger and recently put a hole through the wall with a coffee mug. He is very emotional, crying over things that have nothing to do with him and going from angry to fine suddenly. He treats us well and then suddenly treats us very harshly. One minute he's telling us he loves us and the next he's yelling at us or telling us we're wrong about everything. He even tells me I'm crazy because I was just diagnosed with ADD. He also drinks nearly every day, usually having about 1/2 a 750ml bottle of 80proof vodka. He can go a day or so without drinking, but he's really irritable and he still acts like everyone else is wrong etc... Is this a mental problem or just his personality?