I'd start with just telling Mom what's on your mind... it'll really make a huge difference when you open up to someone -- and Mom loves you and will be supportive.
But the bigger issue you absolutely need to address is that you've always been anxious, and now you are shaking, can't sleep and crying. Those are all symptoms of depression -- even the lifelong anxiety.
Depression comes in many forms, but one, is called dysthymia; it's a long term, low-grade depression that can last for years. People are able to get up and go to work, and look and feel happy most of the time, but their thinking is depressive, they can have exhaustion at times, little motivation, lots of guilt (like living with a mother so she won't be alone) etc...
Without treatment, dysthymia turns into a full blown depressive episode -- filled with shaking, crying, sleep issues...
So... threatment is easy! Make an appointment with a psychiatrist, tell them all of your symptoms and they will recommend some medications -- take those, even if you don't want to -- they will make you much, much better.
You'll be surprised how much of what you think is your "personality" is really the dysthymia -- all of your self-consciousness will go away, that feeling that you are the center of attention, all of it.... I promise!