I have a 6yr old chiquaqua terrior. She has been very healthy up till now. Few days ago, she would occasionally throw up & a little diarrhea. After throwing up she get pretty wobbly & weak in her legs. After laying for awhile, she's able to walk normal. What seems to be the prob?

That's not diagnosable online, sorry. You need to take her to a vet. Make the appt and meanwhile, tell us any little detail you can think of about changes in her routine, diet, people, what she might have swallowed, drunk, other animals around, and what she gets for shots or treatments like heartworm and so on - anything.

Maybe she has low blood sugar

Your pup really does need to see a vet