When we are no longer able to change a situation – we are challenged to change ourselves. Viktor Frankl
You have a great deal of resilience even in the face of tremendous loss and addiction. Your background information says that you are a sophomore in college. Even through all of this you have, somehow, managed to stay in school. The world didn’t deal you the best situation, but that doesn’t mean you do not have a choice in how you respond. The first thing is to clean up the addictions. You know that nothing gets better until that is under control. For this I recommend Narcotics Anonymous – a 12-step program specifically designed to help with serious drug addiction. There are meetings in nearly every county in nearly every state. Google them and find the closest open meeting near you.
Secondly, I would take advantage of the fact you are in college. College counselors are typically very well versed in coping with the college population and drug use. This counseling combined with NA is the first step out of hell.
The part of you that wrote us is the part that believes something can change. I would follow Frankl’s advice and accept the challenge.