Jump over to:
where you will find a heap of blokes with the same "Vibrating Testicles" problem.
After reading them all, it sounds like it is most likely a lower back problem that a chiropractor should be able to take care of. Althought there was no comments from any doctors or other qualified persons. Just a heap of guys with the same, seemingly unknown problem.
As for the squishy ball, i would get that checked! Just like women should regularly check for abnormalities on their breasts, men should regularly check their testies and are strongly recomended to get any abnormality looked at so that testicular cancer can be caught early.
I'm no doctor, thats just my opinion.