Distrust can be part of codependency, which ties into addiction very, very often. In fact emotional highs and lows - including the fears tied to distrust - create intense hormonal and chemical responses in the body and the brain, which become familiar, habitual; and these can become norms for us - not always in helpful ways.
A good question to ask yourself is, is ____ helpful? If no, then what can be done about it?
A lot of recovery groups have holistic, non-specific philosophies, and are open to many people. Even if you find out it might not be a good fit for you, odds are good that one of the participants will have an idea of another place you could try:
This thread also has lots of interesting books and readings.