Hey there!
Orgasm and ejaculation are two different things, but we often come to the conclusion they are "the same", as usually both happen at the same time.
With that said; orgasm without ejaculation is a possibility. However, I do suggest blowing your load every now and then, so that there's no build-up which can cause "clogging."
About edging; I think even in sex your erection quality does vary a bit, so not being 100% hard is fine. I'd think if you range between 80 - 100 % you'll be alright. So, it does count as edging as long as you keep alert about your arousal and PONR.
Strong pelvic floor muscles can indeed either hold back your ejaculation or launch it to the Milky Way. :-D
Lastly, the first thing you asked, about bruising. Hirudoid
Forte (Hirudin) does help with bruises. There's also Arnica ointments. Both these products should be applied only on intact skin. So as long the skin isn't broken (just a bruise), these products should be safe to use.
Internally there's Bromelain that could help a bit with bruising. A decent multivitamin is a nice booster as well.
Happy healing!