YorkieLover9,
I too had to give up a dog a couple months ago. Like you, I knew it was the best thing for both of us. It was heartbreaking but your heart will heal. On your worst days just remember that you will feel better again. There are so many people who want to help you that I'm sure you'll have no problem finding a home for your little guy.
Keep your chin up--it will be okay
Feel free to PM me