"I think I'm going to ask for a blood test next time..."
There, you've solved your issue. Well done. I'd have recommended this if you hadn't said it yourself.
Stop panicking or try to at least. It's not going to help anything and it's causing you excess stress.
Get your butt (and the rest of you) to the local walk-in clinic and get tested to clear up the whole HIV panic thing. It will take 5 minutes, way less time than you've spent sending yourself into a stress attack. And you'll either know right away if they do the instant tests or in a couple of days if they have to send the sample out. I'll put money down on your being perfectly fine, save for the athlete's foot and the wart. Both eminently treatable.
I would suggest that you make it a personal promise to yourself to get checked regularly. Soon after the last sex and a month or two again after that, in case you've caught something that needs time to show up. Then promise yourself to get on a regular checkup schedule, usually recommended every three months if you get back into the casual sex thing, even if only once in a blue moon.
You gotta chill a bit here; warts happen and so does athlete's foot. Neither of these is your typical sign of HIV. People have had these since forever, long before HIV was ever a thing. Athlete's foot is gonna show up from going to the gym - there's a reason it's called "athlete's foot". Warts are a virus and are pretty common. People get them without ever having sex.
Besides, you note that you were wearing a condom, even if it was a tad too big. Did it fall off? If not, you're likely perfectly fine. You've just sent your brain into overdrive. Moving forward, remember to always BYOCondoms to ensure a perfect fit.
Lastly and somewhat off-topic:
Holy Jeebus, nice schlong dude! How the fuck was the condom too loose?!
Good lord... that's certainly a handsome piece.