Sensative testicles

[rydub8]

Hello everyone, for awhile now i've had fairly sensative testicles, in regards to touching them or bumping them. It's not really pain at all, it's more so sensative. When they are tight, or i should say when the scrotum is tight they aren't really as sensative, which is obviously in part due to the fact that they're harder to bump or hit when they're pulled up. Anyway, i have a couple questions
   1.) In regards to bumping them or touching them briskly, let's say with soap your scrubbing your inner leg and you happen to bump your teste, is it normal for that to cause a little sensativity, like i said not really painful just sensative.
   2.) Also, I have been on methadone maintanance for about 3 years now, methadone can lower your testosterone, and i thought i had heard that low testosterone can cause sensative testicles, has anyone heard this, is there any truth to that because it would explain a lot?
   3.) Several weeks ago i felt a small lump underneath around back of my testicle, but, i think i felt the same thing on the other side, and what i think it was, was my epididimus. I have read that often men mistake their epidimus for a lump. And the spot i felt was right in the area the epididimus would be. So just curious is anyone has felt this before and mistaken it or should i look further into it?
   4.) Finally sometimes i notice when i feel soreness in my testicles that obviously as most guys now you can feel it in your lower abdomen too, i have noticed that sometimes when i feel sensativity or soreness in my testes that i end up having a gassy stomach, can gas pains actually cause pressure on your testes, or cause your testicles to feel sore or sensative?

Thank you for any and all answers!!!