Gamer,
I'd point out that self-castration can easily lead to death.
That doesn't help things any, really. ;-)
It's better to look into long-term solutions. If you are OK with castration (as opposed to chemical castration), I'd suggest looking at the Eunuch forum. (Don't have a link, sorry. Simple Google should get you there; they have means listed for destroying the testicles. Saline or alcohol injection, I think.)
There is also the option of veterinary medicines, I can't talk to the efficacy of that, nor the risks.
Cyproterone Acetate, BTW, though crushingly expensive, also knocks the 'nads offline ASAP. Like, a week. Doesn't KEEP them down and out, but it'll get you the peace of mind you want. (and since CA isn't prescribable in the USA, you'd be going the online route anyway.)
I'd suggest some alcohol, ingested orally, with some good music, and maybe some youtube hypnos to help deal with the stresses. Maybe meditation, too. And lots of spearmint tea at least, it should be cheaper than pills. (I'd also suggest Tazo Zen tea, has lemongrass and green tea as well as spearmint.) The objective is to make sure you can endure until you "doctor shop" and find someone who WILL prescribe the necessary meds. Hopefully you have that option...
-Dianna