Reddit mentions of True Refuge: Finding Peace and Freedom in Your Own Awakened Heart

Tara Brach's True Refuge is wonderful. http://www.amazon.com/True-Refuge-Finding-Freedom-Awakened/dp/0553807625

Sounds like your medications are helping a lot! Mindfulness can help you experience that scary darkness, without being consumed by it. Basically you allow that sensation to exist, without identifying as it. Just a non-judgmental observer. Most of the time that feeling is toxic shame ("I am bad / defective" or "Something is wrong with me"), and our bodies do everything they can to avoid experiencing it.

Psychology and medications are important. However, spirituality can help you actually understand your heart, so it can become a source of joy and love, rather than fear. This takes a lot of time, and a willingness to sit with the scary feeling without acting on it.

I think of it this way: there is a universal unconditional love available to all of us. Then throughout the course of life, traumas happen (rejection, abandonment, betrayal) which falsely cause us to believe we are separate from that love. It is important to find that trauma, treat it with unconditional love, and restore our connection to our true nature.

My favorite resources on the heart:

http://intuitivecreativity.typepad.com/expressiveartinspirations/2014/07/understanding-your-core-pain-and-false-self.html

http://joy2meu.com/Fear_of_Intimacy.html

http://www.corelight.org/resources/returning-to-oneness/chapters/chapter-three/

https://www.amazon.com/True-Refuge-Finding-Freedom-Awakened/dp/0553807625