Hey, I know this may not be what you want to hear but,
I am a fellow sufferer of Varicoceles for quite some time from hard ballbusting sessions my ex-girlfriend and I used to participate in and on more than one occasion, she ruptured the veins from kicks with her heels and boots and my sack turned black, blue and swollen from the ruptures.
Her and I went our separate ways a few years ago and I was abstinent from ballbusting for a while until my fiance and I started to enagage in her ballbusting me, and once again my Varicoceles returned and they got to a point where I required surgery. My old post about my journey is below...
http://www.femaledom.com/forum/showthread.php?t=9476
My fiance and I spoke about our future and agreed to stop ballbusting until much later (maybe after kids and when I'm 45 - 50, if I can still produce a kid) because after a Variocelectomy (which I have undergone) the testicles are much weaker to trauma and rupture. I hate everything about it, it was my favorite fetish to indulge but to me, the risks don't outweigh the rewards.
Now, I'm not saying that all men are susceptible to Varicose veins because of ballbusting but it sounds like you are, just as I am and should take more care about the ballbusting fetish.
From now on, I just do hard trampling/stomping on my chest and stomach and even face-busting, but ballbusting will have to wait, at least for me. The proof was also in my testosterone count, when I did engage in ballbusting, my testosterone numbers were wicked low, after a month of abstaining, the numbers returned back to normal levels.
If you're lucky and take it easy for a while, your Varicoceles may recess, for me I had to take the surgical method to fix it and now that I have, I have to be much more careful (which sucks for someone who loved ballbusting so much)