We couldn't suggest any further unless she get diagnosed. I believe that it would be best for you to initiate a check up for her before things get worst.
I think it is just a result of wrong sleeping position. Try to buy a pillow which could comfortably rest your neck and check for some improvement. If this do not work, immediately consult the doctor.
Understand your parents. Before they became that strict, remember that they were as understanding as possible. Thinking more of you makes them into it. You owe them big. Remember that. :)
In both ways, they would surely suffer imbalance in the biodiversity, hence resulting to the lack of continuous food chain. When this happens, some existence of a creature might be extinct or totally loss.
Maybe you should have a dog.puppy first. Something which is cute and fluffy and that you would enjoy playing with. This, in some way, is helping you face your fear about dogs. Maybe it would work.
It's normal for animals to do acts similar to how your dog react to the weather. There's nothing to be scared about except of course when it get really serious and consistent.