Good Morning Keely
I am so sorry you are in a bad place right now but I would hope that you recognize you have what appears to be an anger management disorder with your depression. I am not a professional but I do hope you have a therapist and that you are able to talk through your feelings with this person.
I would recommend a small counseling group approach so as to employ peer support. ...the feedback from a group can help you recognize what triggers your anger and in your post it appears you are pretty angry about life in general.
Stress is your response to any physical, emotional or intellectual demands. It feels to me you are using anger, bottling it up and trying to manage your stress by getting by.
I admire your wanting to help others in your family but agree with Karen, you need to take care of you right now and if you don't you will not be any use to helping others.
You deserve peace and happiness, you are a good person in a bad situation.