Hmmmm.... 10 weeks old is a bit young to be doing much other than reacting by instinct - and he's probably also testing boundaries to see what he can and can't get away with.
If he learns that growing and snapping get him his way, you're in for a long unhappy battle.
If you correct him with fear/frustration/anger in a physical manner (scruff shakes, hold downs, 'alpha roll-overs'), he'll probably respond in like kind, and when he's over 100lbs, that won't be pretty.
I'd go back to the basics. Put him on a NILF plan, ignore and/or redirect all bad behavior, or if it's really bad, calmly put him in his crate to cool-off (so you can cool-off, too).
Be sure to give him lots of things to do where you can reward him. Start training now for 'sit', 'down', 'come', 'look-at-me' (or 'watch me' or 'focus'), so you have things he can DO to get praise and rewards. There's a youtube video called "it's yer choice" that teaches young puppies impulse control (and 'leave it'), which would be a great thing to work on, too.
Denna is our first full mastiff, and we have had MUCH better luck with praise and positive reinforcement versus 'traditional' dominance/punishment training methods. The key for me, has been to bond with Denna so she wants to do as I ask, because we're partners. Now all I have to do is give her a firm 'no' for her to stop what she's doing (most of the time... we're not perfect) - then I give her something to DO, normally "sit" or "go to your rug"... to complete the removal of the bad action and replace it with something I can reward her for.
Since he was just at the vet... did he do a check for sensitive areas? Are his ears still achey? Does his tummy ache? Is he still on dewormers? was he responding out of fear/pain versus anger? When he's relaxed, can you do a full body massage, or does he have sensitive places he doesn't want you to touch at all?
One restraint method the Monks of New Skete use, which works GREAT with Denna, is to put the puppy in a sit, and then sit/squat right behind them, so you can hug them around the chest. Rub the chest in a soft, relaxing manner to calm the puppy down. Being behind and over the puppy, you are in a dominant position, but you're using that position to instill calm, relaxing energy.
Try not to get frustrated, you're just starting your journey together. Try everything you can to keep things positive and calm.
There are a number of threads on puppies being overly nippy, if you run into that more - it's not unheard of!
There's loads of support here - I'm sure someone else will chime in with some other recommendations soon, too.