Boundaries are important here, AO. Can you find some any where to incorporate?
Can you literally just drop it all and run? Like to a vacation? Your sanity is the most important thing here. If you are losing it this bad you deserve a break. You deserve to say STOP and take a huge step back then force everyone else to deal with their problems in your absence. This is not a rude request of you. If you are loved at home the way you are here then I know your loved ones would understand.
I hope you are OK and do the right thing for you. Just remember bottom line as Dee said is drinking would make this all worse. You know that in your heart.
You have grown so much and I have a feeling a BURST of growth is about to break through. We get struggles right before a miracle happens. Don't give up right before you see it.
Hugs!!! xox