CSW= commercial sex worker
You don't get any of the "symptoms" you mention 2 days after infection. It is all in your head - worrying makes you focus on your body and every twitch, ache or cough makes you think this has never happened before so must be disease related. The negative tests were performed by health professionals which you are not. The testing business is 30 years old so 100% accurate. Stop worrying if you can, since you are healthy.
From what you posted no, you do not have an STD. It does sound like anxiety to me.