Have you read this sticky?
http://www.yorkietalk.com/forums/yor...-overview.html
I'm not sure about the 2nd bordetella - it's been too long since I had a puppy.
I think a lot also depends on the size of your yorkie. I always waited until 6 months to get the rabies. You are right to be concerned about over-vaccination. Vets are good at it! But I would urge you to read the above sticky and do your own research, so that you can make the best possible decisions for what you want for your yorkie. I hope some others will come on and offer advice.
Is your yorkie still sneezing? One thing I will offer advice on is to never get any vaccinations while they are sick or not up to par.