I am so sorry to hear you are still going through this with Nisha. It sounds absolutely frightening, you must be absolutely exhausted. From the sounds of it, I am thinking seizures also, because of this article I found. Here is an excerpt with the link for the rest of the article:
Seizures are one of the most frequently seen neurological problems in dogs. A seizure is also known as a convulsion or fit. It may have all or any combination of the following:Loss or derangement of consciousness
Contractions of all the muscles in the body
Changes in mental awareness from non-responsiveness to hallucinations
Involuntary urination, defecation, or salivation
Behavioral changes, including non-recognition of owner, viciousness, pacing, and running in circles...
...Despite the dramatic signs of a seizure, the dog feels no pain, only bewilderment. Dogs do not swallow their tongues. If you put your fingers into its mouth, you will do no benefit to your pet and will run a high risk of being bitten very badly. The important thing is to keep the dog from falling and hurting itself. As long as it is on the floor or ground, there is little chance of harm occurring. If seizures continue for longer than a few minutes, the body temperature begins to rise. If hyperthermia develops secondary to a seizure, another set of problems may have to be addressed.Canine Seizures