I don't feel anything out of the ordinary on my testicle at all. To be honest, I only feel pain/discomfort when I have the IBS/anxiety. There are no lumps, bumps, enlargements or swellings. I know this for a fact. Just a bit of tenderness. I'm going to delay going to the Doctor to be honest - if I went to the Docs about everything I've been obsessing about over the last few months I'd be permanently there. I'm not even joking.
But thanks for your concern.
Its funny though, I did some research on this online after I posted here, and I found that a LOT of guys with IBS have testicle ache.