It doesn't matter if she peed in the shower or not - that's not a risk.
Her rubbing her vagina and then your butt isn't a risk, either. Hands don't transmit STDs, and given that you were in the shower, presumably with soap, any fluids with germs would have been washed away with the soap and water.
When a condom tears, it's catastrophic. You'd notice it.
The burning the next day could have been from anything - dehydration, irritation from alcohol, an irritating food like something citrus, etc. STD symptoms don't appear for at least 2 days at the absolute minimum. Whatever this was, it wasn't related to an STD.
Whatever the spot was that you saw 11 days later wasn't an STD, either. No symptom only appears for such a brief time before disappearing.
No STD gives you tingling in your hands and feet, either, or stiffness in your neck. A lot of your symptoms sound like you might have a pinched nerve or a disc issue in your back, or something along those lines. They do not sound like an STD.
You had protected sex, which means you were only at risk for HPV, herpes and syphilis, and condoms offer significant protection against those. You've had no symptoms of any of those. There is no HPV test for men, and you can test for herpes and syphilis again at 6 weeks, but I wouldn't expect those to change since you've had no symptoms of those.
Really, you have very little risk here. I wouldn't worry at all.