As you had no risk and negative tests to confirm it, this is not an HIV concern. We are now closing this discussion.
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I think you were the only one that ever had any doubt that your HIV test would be negative. You had no risk, of course it was negative.
You did not have any risk for HIV. The symptoms that you mention in the question are certainly not due to HIV, because ARS symptoms WILL NOT IN ANY CASE appear on the very next day of a risky exposure. Your symptoms are mostly due to anxiety. See a physician if they persist. You can go get tested for other STIs, but you will not get HIV by tasting precum. The very odd cases of hiv being transmitted orally always had extenuating circumstances like a metmouth, or a heavily bleeding gum.
From the incident you describe you are not at any risk for HIV. As for other STD's there is a small risk so you should get tested for them but not HIV. The risk is extremely low. All other STD's that you might have caught from unprotected oral (small risk) are curable. Your symptoms are probably from stress! Just relax wait for the STD window periods and get tested. Let us know what happens but I'm confident that you are fine.