Exact antonym of a physical euphoria?

I'm writing a novel and the line I would like the synonym for would be:

My heart stopped and for a moment I was in BLANK-on the precipice of vomiting, soiling myself, and passing out all at the same time."

I believe the word I'm looking for is an exact antonym of euphoria. I don't believe "dysphoria" would work in this case, as I believe that word has strong connotative ties with mental health and its respective disorders.

As of right now, I'll probably use the word 'misery' as a placeholder; however, I am not happy with this word right now and would prefer a stronger word.

Other suggest synonyms through Merriam Webster including despair and depression but those aren't necessarily fitting for the physical context within my example sentence

'Misery', 'despair', 'depression' all work fine as antonyms to the mental state of bliss, which you've confused with euphoria. The actual meaning of euphoria—which is about a feeling of well-being in an otherwise or normally sick person or unjustified/mistaken cheerfulness—should take antonyms like 'relapse', 'pessimism', and of course 'dysphoria'. W/r/t your actual sentence, though

...on the precipice of vomiting, soiling myself, and passing out all at the same time.

none of those are remotely apropos. You're talking about a state of physical dis-ease and something closer to

nauseous

Of a person: affected with [a feeling of sickness with an inclination to vomit]; having an unsettled stomach; (figurative) disgusted, affected with distaste or loathing.

or any of the myriad synonyms for apprehensive (e.g., overwhelmed, tremulous, panic-stricken).