Yorkiemini brought up an excellent point: exercise. Most Yorkies need lots of exercise and stimulation. They tend to be bundles of energy. If there is no outlet for that energy, the dog will be more difficult to train in general.
My Yorkie boys are 7 and 8 years old and still don't know how to enjoy a casual walk unless we are out for extended periods of time, more than an hour. Our daily walks at the office park are usually fast paced.
A daily routine is calming. Basic training in the house also helps. My boys perform simply tricks for kibble: sit, shake hands, down, and so on.
Use positive reinforcement training for everything. Do not show your frustration or anxiety. The negative energy will only contribute to your Yorkie being hyper.
If your daughter lives close, perhaps she could help with training. There are videos on YouTube that are free and very useful. Trainer Victoria Stilwell has a website and books that are available at the library.
Yorkies are a challenge. Don't feel bad if you decide this is not the right dog for you at this stage of your life. If you do decide to re-home him, just make sure to find the right home.
Best wishes in making your decision.
__________________ Kristin, Max and Teddy  |