Should i be worried about pain in testicles?

I've had a dull pain in my left testicle for the last few month's, It goes away for a few week's or some time's day's and then kills for a day, Bad enough that people ask me walk im limping at work. The pain's at the back and bottom of it, It Always gets super super tender, I went to the doctor a few month's ago when it started, And they said it's totally harmless and it was a cyst or something, Can't remember exactly what, but they said that they won't need to do anything unless it gets bigger and they have to drain it or something... Any way's I've been googling alot and it seems random ball pain is EXTREMELY common, Like it's alot of the top searched thing's and alot of the store's sound exactly like mine as far as random pain. And it's been hurting like hell the past two day's, I'm gonna go buy some new more spacious work paint's since the ones i have are pretty tight around the ball and stomach area, (since I've gained 30 pound's in the past like four month's} lol. Thanks {: {: