I think I am going to scream at my mom.
What is causing you to want to scream at her?
She has a drug problem, and frankly, I find her gross and disgusting.
Drug addiction is a family issue, as it impacts the addict and everyone around them. Please know that your anger is a understandable and valid. In fact, what you're feeling is you actually caring. Yelling at her though isn't going to help you or her.
Haha, she's going to get what's coming to her!
Addiction is a disease and I think you should be mindful of that and try to be more understanding when it comes to what your mother is dealing with. That said, you should focus on yourself first and there are groups and help available, for free, for people who have family members who are addicts. You can get advice, hear stories, share stories, and figure out how to help yourself and your mom in a way that benefits you both.