My son had a suspected testicular torsion (he had exploratory surgery and it turned out to be a twisted "Hydatid of Morgagni" (sp?) which was removed, and the testicle was anchored with a stitch), and yes, the pain tends to be sudden and severe. However, you should never leave it to chance, go get checked out a.s.a.p. The worst that can happen is you find out what it is and it gets treated. Good luck!
sorry i also wanted to add that i am feeling some slight abdominal pain on that side
I forgot to add that I am 22 years old if that helps at all