Gas pain and dull ache in testicles?

Last week I touched my left testicle and it hurt. Woke up the next day and it was fine and hasn't been tender at all since. A few days ago I got dull gas pains in my stomach and noticed my scrotum was tight and my balls felt a little larger and firmer (maybe just from tight scrotum, idk). I still have the gas pain (dull, burping quite a bit) and now I feel a dull ache in my testicles and kind of in my lower back and legs. I have been obsessively checking for lumps and have found none. I've had testicle aches before and they've gone away after a while, but now it's paired with gas. I feel like the testicle ache may be my imagination; it isn't constant. But I'm worried that I have cancer.

So basically: why won't my gassy stomach be relieved and why would my testicles ache?
Gas pain and dull ache in testicles?
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