Chronic pelvic pain in men is more prevalent than I thought and often misdiagnosed.
One potential cause that is often overlooked is referred pain from lower back injury/disc.
I have seen cases where men have various pain/sensation throughout the pelvic/genitals, where they were convinced something was seriously wrong with their testes/penis, only to test negative for any direct cause. Sometimes these cases can result from a nerve in the back. Prostatitis is another cause of this sometimes vague pain. Of course, stressing about it makes it seem worse.