Blecch is a way of conveying that something is gross or disgusting. People use this word for things that taste icky or look or smell gross, etc. The cs and hs at the end of the world emphasize that it's pronounced guttural at the back of the throat. For more dramatic effect, it can be written BLEACCCHHH!
church hurt is where you experience a degree of distance, pain, or judgement from your church community. Essentially, you are just unable to “find your place”. This is prevalent in the Christian community, but can be extended to other religions.
Now that I am an adult I am beginning to heal from the church hurt that was inflicted on me as a child.