Wow what a bad year old fruit, sympathies.
Just a note about "Stampede"; it has been running in several countries for several years. A computer program assesses your current state of health & fitness, and allocates you to one stream of treatment appropriate to how much your body can stand.
From the statistics of the results, they hope to define the 'gold standards' treatment for various stages of the disease.
So, whatever happens, you contribute to those in the future, you are advancing medical knowledge; you owe that to your fellow man (who may be your son or grandson). It helps you feel useful at least!
I believe some arms of the trial are closed (that is, they have enough to make statistics meaningful), so A, B,C are done already, maybe further now I don't know.
I was enrolled last year on Trial H, which is the fairly routine hormones followed by external beam X-rays, followed by hormones which have been added to due to a small PSA 'Bounce' about 18 months after diagnosis. There are I think other arms to the trials, and there are indeed other trials altogether being run.
One thing's for sure; if my tiny numerical contribution helps to give someone's son (possibly mine) to have an easier time in a few year's time, then my work here is done. Meantime, the extra attention one gets from experts and researchers whilst on the scheme is reassuring.
By the way there is also a genetic survey going on, ask about it, it is only a questionnaire and you have to try and recall all your family history and so on. Doesn't matter you can't remember everything, you just do what you can and as well send a couple of simple swabs of in the post (so they can read your own DNA).
Just being 'useful' can be a lift, go for it and feel smug, it all helps the reality.