Suggest Treatment For Fits

is my mother sick? my mother has constant fits of rage at least 5 times a day for minor things. she tends to throw things at me and my sister. she also beats us up. very abusive. abuses us physically and mentally. says mean things she normally doesn't say when she's in a good mood. she is under a lot of self induced stress and is very suspicious of other people assuming they are trying to hurt her. constant rapid mood swings make interaction with her nearly impossible. always leads to arguments. is she suffering from something serious?