Rottie40; did you do surgery on your dog with the liver shunt? How did she/he do? I am praying that this is not the problem with Nisha.
As far as the 'anxiety' thing...4 vets have now seen the video (as well as two behaviorists) , and all, with no doubts say it is a seizure
. Complex focale seizure....affecting just some parts of the brain; not all as in a grand mall. Now the chore is to figure out what is causing the seizures.