Emotions

If fear comes from the reptillian brain, while the mammilian brain handles "emotions," does this mean it is possible that fear is more of a physiological state rather than an actual "emotion?" Or does it merely mean fear is the oldest emotion? How many emotions can the brain generate? Or could almost every state of mind be classified as some variance of an "emotion?"

It's purely mental, therefore, arguing non-existance.  Thoughts are not tangible, therefore, cannot be ACCURATELY explained.