In search of inner peace..

I'm in a very bad way in my life right now. Therapy has only been so beneficial, and medication rarely brings anything aside for a slight normalizing effect. I won't get into the specifics, but basically my biggest problem is that my life is full of inner and outer hatred and depression towards things. Everywhere I look I am constantly reminded of bad things, or just thrown into irrational feelings of anger. I always focus on negative as opposed to positive things. I'm not some sort of guy who gets off on personal anguish, but I've just been like this my whole life, and because everything else around me has become so negative, my negative environment feeds my negative psyche.

I have much inner pain, and I am desperate for some help. I looked into TM and it looked very appealing until that price came up. I was literally shocked when I saw it. $2.5k is not an amount I can just go and spend since I make around $25k a year. At the same time, I don't want to get my hopes up and delve into this only to get disappointed. I understand the money back guarantee, but that still isn't enough for me.

I need more in terms of advice and real support of the benefits of this system. I am someone with ADHD and my mind constantly wanders into horrible places. Can someone like me expect to find some inner peace, or at the very least stress relief with this method when properly applied? Or is my mind and psyche in such bad shape that I require more than what this system was made for?

I could go into more specifics about what troubles me, but I don't think I should make my first post a book. Any feedback I can get would be greatly appreciated.
Thank you all in advance.