Is it something w/ nerve endings that causes chills, tingling sensation throughout head & body when excited or skin is rubbed/massaged? is it normal?

Anxiety: I understand your concern. Your symptoms are likely due to stress in your life. At age 36, stresses of relationship, marriage, separation , parenting, unresolved feelings of worry, fear, hurt, resentment; work and finances can cause Anxiety with physical symptoms. This is not normal; it indicates need to see a Psychiatrist for Diagnosis and Therapy. Do Breathing Relaxation, Yoga and Meditation.