Ohalvo, I was talking to dh last night we were remembering what a little sod our Wheaten girl was as a puppy. She had me in tears on several occasions and I genuinely didn't think she cared for me at all. On one memorable occasions she stole a bone and took it under the dining table - stupidly I stuck my hand in to get it back and she proper bit me. I was ready to give her back there and then. She also used to food guard and would bite anyone who went near her food bowl - we think as she came from a very big litter and had to compete for the food bowl. BUT she wasn't aggressive, she grew to be the softest, gentlest girl - even when we had the dcs she never once reacted badly to any of them.
She wasn't a cuddly pup either, I think Wheatens are always on the go and don't really like sitting still for cuddles. I used to get offended that she was so pleased to see anyone/everyone else, but was never really interested in me when she was a pup.
As I said upthread, the terrier part of their nature is at it's most apparent when they're puppies, but they do settle down. They're always lively, bouncy dogs, but they do drop the terrier act eventually.
What made the difference was starting training classes and learning how to interact with her - and as you know, she turned out to be an awesome dog that achieved such a lot.
Before you give up on him, please book an appointment to see an APDT or APBC behaviourist. This is new to both you and him and it could be that all you need is someone to come and observe the situation and offer practical advice. It's very hard to offer advice over a screen when we can't see his body language and how he's interacting - you really need a properly qualified behaviourist to help.
There have been lots of other threads in the Doghouse from people who felt like you did in the first few weeks of their puppy's life. It's not unusual at all, because it is a huge undertaking and massive responsibility. Some people seem to go through something similar to PND from the stress of it all. I've tonnes of experience - Pip is dog number 7 for us, but I've had days where I felt I couldn't carry on. Not being able to go out for longer than half an hour is seriously affecting my mental health and I've had quite a few people tell me to give up and let someone take him on, but I know we can sort it out, it's just going to take plenty of time and patience.
At the end of the day, if you really do want to rehome, your breeder should take him back no matter what. I hate to say it, but if she won't then she isn't a decent breeder. If you do feel you have to give him up - my best advice is to contact the Breed Club and ask about breed rescue - that way you can be sure he'll go to a vetted Wheaten home.
I'm so sorry you feel like this. I do believe Floyd is a fairly typical Wheaten and once you have started training in earnest and begin channelling his energy etc he will settle down and hopefully turn out like my girl did. A properly qualified behaviourist will make all the difference too - but ultimately it's your decision. 