Questions after first prostate orgasm

Throwaway for privacy reasons. So all in all, it felt amazing but I'm freaked out because of 3 things: 1) my prostate or something became monstrously, scarily huge and diamond-hard 2) I'm very confused because I ejaculated but I never touched my penis 3) I only used my fingers cuz I'm penniless until payday at the end of the month. So, basically, WHAT THE HELL does YOUR body do when you prostate orgasm? My body really confused and shocked me. Does your prostate or front wall get gigantic and hard? And was it really just my prostate getting that big? Or was it more than that? And do all your muscles down there contract super hard?? I'm still in disbelief that my body could do all those things. And I'm confused because I ejaculated. I read you're not supposed to ejaculate. I didn't stimulate my penis at all. I did my perineum, but I wasn't pulling the penis skin. I was just going for more prostate stimulation. If you have questions on what I did, you can read the story below. Sorry it's so long and… scientifically explicit.

Starting 2 weeks ago, I started seriously trying for prostate orgasm using all the suggestions on the aneros wiki and on these reddits (basically, be very gentle, still, no very vigorous movements, controlled and focused breathing, etc.). My biggest and only variation is I have no tools. Just fingers. At the end of the month on payday, I'm going to buy aneros and nexus revo. But as of now I'm just using my fingers.