Hello, i am just reading this from my all feed and am not asexual myself, just as a disclaimer.
This sounds like some deep and unresolved trauma, I can get annoyed and bored with the widespread hypersexualisation myself, but the fact that you have to grapple with sexual contents through what is essentially a personal breakdown is a very extreme reaction.
Have you considered therapy to get at the root cause here? The way you describe it your condition is utterly debilitating and any health insurance worth their money should provide you with treatment for this.