How do you know that everything is in constant flux? What epistemology are you appealing to? Logic? Reason? Feelings? I don't mean to sound snarky. It's a legitimate question. You sound like a smart guy, and I don't want you to waste your money and time on a path that, in my opinion, doesn't lead anywhere.
Post-Modernism is riddled with contradictions. It makes truth claims about the absence of truth. It argues that we construct meaning, while cl. aiming that deconstructing is a fruitful pursuit. Whenever you make a claim, you have to have some sort of criteria for what would constitute validity. How does Post Modernism accomplish this? It doesn't. To quote Noam Chomsky, "It's not even false, because it doesn't have a measure for its own validity".
It's true, that everything is in a state of flux. Entropy is a great example. However, "flux" itself is a constant, that can be measured. Remember: Relativity and Objectivity are not opposites. They're intertwined. You need less Godwin, and more Einstein.
I'm not being a jerk here. You said it yourself, that Post Modernism riddled you with anxiety. The reason, is that it didn't help you process information, which should be the entire point of education, right? How do you think, how do you communicate. Where post modernism fails, is not in terms of its skepticism toward certainty. There is no certainty. However, it misunderstands the way knowledge and perception work.
I have an Honors degree in English as well. They dragged me down that rabbit hole to. Wrote a thesis about how Hamlet predates Bacon's Novum Organum, while at the same time the subtext is about inductive reasoning. Hamlet went mad the moment he failed to look behind the curtain. He stabbed first, asking questions later... That's how he tainted his mind.