Inanna, I feel so much empathy with you. And I agree with niecie, people don't become addicts for no reason. Addictions are a way of escaping pain. I had to laugh, sorry, when you said you are 36. I was imagining a 22 year old, someone just out of the parent's home.
I would advise that you do encourage your DH to stay well out of it, and definitely not have any sort of conversation with your parent's about the state of your mental health. Nothing good can come of it, and he has to remain on your side or this situation will affect your marriage. Teenagers push boundaries and assert themselves, it is part of their development and is normal. You hardly sound like you were a big handful, unless you have missed mentioning a teen pregnancy, going missing for weeks on end, drink/drug problems, burning down their house, or borstal.
You sound like you need to detach from your parents emotionally and put up boundaries with them. I think you will not usefully be able to 'sort out' the past with them, and so the only way is to detach (untangle!) from them, work on your own self-esteem and make your own life wonderful independent of interaction with them, and move on by setting strong boundaries with them (let them know that you will not accept them criticising you for the past). You are not responsible for their happiness and how they react and vice versa. And should not have to put up with a 4 hour character assassination about things that happened 20 + years ago (I would have flipped too).
Also you need to not expect a particular response from them when you express your feelings of anger that you were neglected emotionally as a teen, if they were dysfunctional then, they will still have those issues within themselves and you cannot expect them to behave normally. They will not have the capability to realise that they were anything but perfect, hence the phrase toxic. You need to learn to let it go, write a no-send letter (see toxic parents book) expressing why you feel the way you do, and realise that the healing has to come from within you. You may never have the disney relationship you want with them, but you can have one where you are in control of your feelings and can control what you will accept from them.
There are so many resources out there to help you do this, therapy, self-help books, web sites. Toxic parents by Susan Forward is a good one and helps you work through the issues you describe, but better (I think) is CBT for Dummies which concentrates on your own emotional well-being and ways of dealing with situations from within you (it is written by two psychiatrists from the Priory). Non violent communication by M. Rosenberg, is supposed to be good, basically teaches you to change the way you phrase things that receives a better response from people. Boundaries by H. Cloud is quite good, and helps you learn why boundaries are needed and how to set them up.
Good luck.