Ok, I've been and come back.
He said the chin was healing nicely (despite Lightning catching himself while we were there with his nail). He said the other bit loked very sore and swollen, but that it should get better from hereon in.
I've got to bathe him (chin and bits) twice daily and give him metacam once a day for a week (this did concern me because I remember Randy saying it can damage the liver if you give it for more than a couple of days) to reduce his swelling down there.
I've got Panacur for him and Dusk, and we'll treat everyone else if a problem shows itself in anyone else. He said it was clearly very early days for these worms because there are not many, so hopefully that is that (doubt it though, lol). Helpfully, but totally unrelatedly I scrubbed down the patio and everything last night so that was good timing most definitely on my part. I'm going to try to feed the Panacur on their favourtie foods as opposed to from the syringy thing because syringes stress me out so much and that will convey to the buns.
He mentioned getting him neutered. If I have to, it throws everything into space again and I have no idea what I would do if I did have to get him neutered (RE his brothers because him, Dusk and Angel were the ones I was going to keep intact for breeding in the future).
I've got to take him back in a week, but sooner if anything looks worse. He didn't want to just give him anti-biotics as a preventative because he doesn't want to upset his gut, cause diarrhoea and make everything sorer and more painful.
Thanks you Pipp and Blue Giants for replying, it means a lot
And in the depths of my not so big crisis, what do I do? Feel the need to flirt with the vet. Oh yes. I couldn't help it, he was really fit. Shame on me.