6 months for a quarantine is absolutely crazy.
That quarantine period was created at a time when there were no rabies vaccines. As to how long it takes for a rabies victim to show symptoms - it depends.
Most viruses and parasites are species-specific, meaning that only one type or related types of animals can get it. Apparently any warm-blooded animal, from mice to whales, can come down with rabies if exposed.
Rabies exposure doesn't depend on a bite. Apparently, the virus concentrates in the saliva of the victim, and just getting the saliva on a scratch or other break in the skin can introduce the virus. The rabies virus travels in the nerves, and the closer to the brain the point of introduction is, the sooner the victim will show symptoms. The amount of virus that gets into the system also affects the speed with which the disease develops. There are cases where the time between a known exposure and the point at which symptoms developed was a year or more. Obviously, those were extreme cases, but with an incubation period that can be as long as that, it is possible for an animal to have an unknown exposure, get vaccinated at a later date, and still develop the disease. But, where do you draw the line between reasonable precautions and paranoia? At the moment, the line is drawn at 3 weeks.
Even though rabies vaccination for dogs and cats is required in the U.S, cases still occur. Just a couple of days ago, a 6-year-old boy in Florida died of rabies after being scratched by a bat. A few years ago, a number of children at a school had to be vaccinated after someone brought a puppy to school that was later diagnosed with rabies. The reason for the 10 days to 2 week isolation period after a biting incident is that the possibility of transmitting the virus only occurs shortly before symptoms appear. If the animal doesn't show symptoms within that period of time, it probably couldn't transmit rabies, even if it is actually infected.
you are sort of half awake half asleep. And you feel like something is holding you or choking you and you cant scream for help.
The "choking" part sounds more like sleep apnea.