Hi! I apologize, but I am a tad confused. Are you aggravated with the infant Yorkie? Or, are you aggravated with the BF? 'Cuz, I'd guess you'd need to handle those situations differently.
You'll need to treat the infant Yorkie...i.e., "puppy"...the same way you'd treat an infant human that can do little to nothing for itself, either...by meeting all its needs and realizing your own shortcomings and getting better at it as the puppy grows and learns...and forgiving both it and yourself when you are temporarily unsuccessful...and gradually and persistently guiding it toward the schedule and training you want it to have. You will need to
LOVE it to do these things for it...or at least not resent it...and it will
LOVE YOU BACK twice over! Most of us find the 'loving' part pretty easy, and I hope you are able to, also.
If it is the BF that is the problem, I believe you would need to look at the reasons and find a way to resolve them to your own satisfaction. Happiness is for everyone involved...you should have some too.
In the meantime, I wish you the very best of luck and hope you are able to get enough rest to be able to cope until things get better...and they will as both you and pup get better together. These will be days long remembered...you will want them to be happy memories!
Congratulations on your new Yorkie baby!
Oh, and maybe you could post some photos, please...