I hate my dog since having a baby

My dog is about to be 10, although acts like he’s still a puppy. He has been an “only child” basically his whole life but has lived with other family dogs temporarily. I’ll admit, I spoiled him and treated him like a human child. It was very obvious he was just filling the hole in my heart that longed for a real baby. I would stress constantly over his well-being in every sense. He was my priority.

My son is about to be 11 months old and since he was born the dog has not been handling the change in attention. As much as we tried to keep it fair, he’s still a dog at the end of the day, he’s not coming first over my baby. But we are 11 months in with no change. He consistently whines, barks 24/7 and doesn’t listen!! I have a headache every day from listening to the dog. All I do is yell at him. It’s making me an angry and negative person. He was so well behaved and it’s clear he’s rebelling and trying to get our attention. He also nipped at the baby the other day. I’m at my breaking point. The dogs behavior after almost a year has not adjusted to this new life and I spend more time yelling and locking him away then anything else. This dog was my whole world. And now, I don’t want him. It pains me, I feel angry with myself. How could I let this happen? Why can’t I be the mom that balances both kids and a dog? My dog is just meant to go back to the “only child” lifestyle. So, what to do? Anyone ever relate and find the rainbow at the end of the tunnel? I’m at a loss.