Since when you noticed this knot?
Is it increasing in size?
colour of knot?
Is this hard in consistency?
Is this reddish in colour?
What is size?
The cartilage you described is called Tragus.The area between Tragus and cheeks has many sebaceous glands.So possibly this is an staphylococcus infection of sebaceous glands in that area called furuncle(boil)
Small boils may subside and go without any treatment. You can ease pain by covering the boil with a flannel soaked in hot water. Do this for 30 minutes, 3-4 times a day.
If the pain is not subsided you should consult your doctor to consider antibiotics .
The light headedness can be a result of knot causing irritation to external auditory canal due to its pressure effects.