Is the anal orgasm the same sensation when you had a wet dream? I actually remember how my wet dreams feel like, they are more intense and more pleasurable ejaculations than the ones from jerking off, but not leg trembling or feeling like dying.
For me hitting the prostate, and I know where mine is, does not work well but maybe I'm not doing it right. Taking a dildo in-and-out like 1~2 inches from my hole works wonders and it makes me cum very quickly, and yeah, the cum pours out instead of shooting out. But again, those are also just better ejaculations.