What Causes Testicular Swelling On Resting Post Disc Prolapse And Herniation Injury?

Male age 53/height 5'7"/17stone hi i originaly bent down while i was working to pick something out of my toolbox and felt a sharp pain through grion to buttock,resulting in(according to physio) Left L3/4 large disc prolapse and possible herniation 7 week ago, i had neuro symptons in L buttock/groin/knee/shin/thigh/calf varying from tingling/burning/cold/aching..all left side on nerve endings heat/ice made it worse, i am a lot better now and am planning on going back to work next week but after exercises from physio or if i sit around after about 6 hours my left testicle swells up is this a nerve problem or could it be something else ?