Thank you for your medical query at AskTheDoctor.com
I understand your concern.
Pain in the testes region and stomach pain indicates an orchitis-epididymitis where both the testes and the epididymis are inflamed due to an infection.
It could be due to UTI, and you need to be evaluated by your urologist and you need to get your urine tested to check for microscopic bacteria.
In such cases, your physician can recommend a course of Doxycycline 100 mg twice daily for 7-10 days. This antibiotic is very good for urinary tract infections and prevents resistance.
Hope this was helpful,
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