Papillon Breeder Wanted

I have two papillons. One is a 5year old female and the other one is just about 1 year old male. they are not related. The female was very wobbly on her feet and her head was wobbly side to side and she wasn't responding to food or water or to my voice. I took her up to the vets and they couldn't find anything wrong with her. The next day she fine. Then two weeks later she was wobbly again but as bad as the first time. This hasn't happened before and I've had her since she was 3 months old. But now my lil boy is doing the same thing and then he vomited. I'm trying to find out whats going on with them can somebody get back to me please