I completely understand, I have some past traumas related to medical care as well but I have a big medical kink too, it’s true Freudian psychology stuff 
I do have steel claws too and yeah, I do like mess around with them. I’ll be trying to be all serious at an event then I’ll look at Master or one of my mates, hold up my claws and declare “rawr”. Never let them know your next move
3 canes, 3 whips, a paddle, a tawse and a crop.
Choosing a favourite is impossible.
It’s tough to beat a good crop.
We have a ton of fun with basic bed restraints
You don’t mention just how kinky you wish to be and it can be a huge rabbit-hole of possibility, but the tone of your post seems to suggest, “go hard or go home,” so here’s my suggestion.
When my wife and I are not pegging and/or using my chastity cage, my favourite go-to is definitely my spiked scrotum cuff (see profile pic, not on LH). Its original purpose was to be locked around the penis shaft but it was too small for my girth; but I’ve found that using it as a ball stretcher works great, especially when I attach a leash and give that to Sexterminatrix to, ah, “guide proceedings”…!
I’ve since bought a heavier cuff with adjustable spikes that custom fits my girth and allows us to control how much it “bites” when things start, well, growing. On rare occasions, I’ll wear both and attach them to the same leash, which gives Sexterminatrix a huge sense of power (and my 100% undivided attention!).
Admittedly it’s not for everyone, but for that dominant (or dominated) vibe, I find this fits my and my wife’s needs wonderfully.
We’re further into our BDSM activities now so I can give a definitive answer.
We expanded our collection now but we’re homing in on 2 or 3 favourites.
For pain the 6 mm diameter synthetic resin cane is amazing. It is right on the edge of what is bearable for me.
My favourite though is the bullwhip.
There is something about being hung from cuffs and whipped that puts me in a different head space.