I do better in writing too; I've always preferred written communication over spoken, for most things -- I think it's because no one interrupts.

Plus, it allows me time to actually consider what I want to say, instead of saying something not quite right, then trying to pull it back in and say it better, which never works.
But really... you need an authentic psychiatrist who can dispense medication, not just some psychologist; if you don't correct the neurochemistry, there's no chance of ever being able to address the problem. You said you had a very unhappy and difficult childhood, and I did too -- not poor or anything, but.. well... alcoholic mother? Things like that are NOT just "in your mind," they leave their mark on your brain in myriad ways, and you have to fix the chemical problem before the thinking part is ABLE to do any good. Growing up in a highly stressful environment makes your brain adapt in ways that later are not healthful, and each successive trauma that you endure changes your brain even more to the "not healthful". The PTSD situation I dealt with wasn't just one or even two "traumas," it was 40-odd yrs of them.
Andria