Well, lots of things are possible. Most of them are outside of STI field. Your risk for STI exposure was low but since you're experiencing symptoms, it may be worth another check.
Tingling of your penis tip is more often caused by non-STI causes (anxiety, irritation, dehydration, allergy, etc.)
A constant prolonged pain in your testicle is most probably completely unrelated to STIs. But it should not be ignored. It may be a sign of prostatitis, or some other medical condition, possibly surgical. I would definitely check it up with an urologist.
If you are concerned with STI risk, I would recommend retesting for chlamydia and gonorrhea. But there is no use testing without your partner (you seem to have already learned that).
Take care and keep us informed on your progress.