*hugs livluvdancesjda* Whether it be the loss of a love one or just a rough day it is all pain that shouldn't be in the world and equally important to cope with. Don't think of your problems as less than anyone else's and "hate" here shouldn't be a concern you are surrounded by supportive individuals that know what you are going through here.
Regarding what is bothering you, I can only imagine the depression that surfaced upon hearing you had to quit dancing. Losing a passion is very hard. Have you tried finding something else you can become passionate in though? I say it to everyone as it is one of mine, but what about Art or Writing to release some emotions in a positive way? There are endless others of course its just a matter of finding what you enjoy. Try and explore yourself as a person and discover things that make you happy.
Have you tried discussing how your mom's actions effect you? I know this is a lot easier said than done, but maybe sitting her down and describing your thoughts will help her realize.
Love,
PeaceLove