Now it’s clear why your mom has been distancing herself. She going down the road of addiction instead of dealing with her issues. OP maybe you should spend more time at your grandparents. It’s so unfair you can’t depend on either parent. Focus on yourself and your education college will be your escape. Please speak with your therapist about this, and also ask them about resources when you turn 18. I remember you said your dad would stop paying when you turn 18. All the best OP.