Hey Tobin
How nice to be able to say you now live a normal, content life, good for you!
My understanding/experience with breathwork only goes so far, but here goes. The idea underpinning breathwork is that inhibition of breathing is one of the body-mind’s strategies of suppressing aversive inner experiences. The point of breathwork is to open breathing up again, which inevitably reactivates these suppressed feelings, memories, sensations etc. in order to integrate them. In my recollection, the clenching and contracting of the fist/body can also be interpreted as resistance, i.e. another way the body-mind is trying to resist the resurfacing experiences, although I’m sure a biomedically trained person can explain the clenching/contracting as a physiological response involving the words hyperventilation and heightened oxygen levels.
So, a breathwork therapist will then gently support you in “breathing through” the surfacing material until it is integrated, for the time being at least. If breathwork is your choice of therapy (I’m not comfortable with calling it a meditation), then, at this point, I wonder if you could benefit from assistance? Seems pretty intense to do that kind of work alone...
Mindful awareness and accepting attitude towards your moment-to-moment experience is also part of breathwork (but doesn’t make it a meditation imho). In that regard, you seem identified with the story / interpretation / fabrication, and attributing a will of its own to it. What makes you say “It won’t let me see it?” You also say you feel cursed in some way? What makes you say that?
“I won’t let you win,” is just a thought. I remember a similar one: “If you don’t get up and stop this meditation right now you will go mad.” Very unsettling at that time, a mindf%ck really, but just a thought.
As much as it feels real, as much as it’s scary or overwhelming, practice remaining in the observer perspective. As raushan said and as you undoubtedly know already: stay with whatever you’re able to notice at any moment and don’t follow up on any reactivity that might arise.
Don’t try to make anything happen (if it's not part of the instruction, like the connected breathing). Seems like something has surfaced, and you're just starting to figure it out. You mentioned cultivating patience, a good idea.

Kindly
Alex