i am a 25 year old female, i have been having headaches about the past 6 to 8 months, the past month to month and a half they have been severe, 2 weeks ago at work i felt like i was going to pass out, i have been feeling fainty and weak, last week while driving i had to pull over, i started getting double and blurred vision , then last night i noticed a knot that has popped up in my left temple area, the knot shows when i open my jaw, what could this be?