I think we've all been through this! When Howie first got into this stage I remember thinking "Oh my goodness, what have I gotten myself into?!" I think my yorkie acted like this on account of his teething and bottled up puppy energy. Bully sticks are a LIFE SAVER. They help with the teething and they burn off that nervous yorkie energy that they have.
As far as your potty issues, be patient and consistent. I thought it would never happen, but one day Howie just got it.
Keep your head up b/c it will get better!!