After crying for like two hours, my head is hurting me so badly that I can't sleep. What should I do for the headache?

Consider taking. Tylenol (acetaminophen). Breath in slowly ; deeply through your nostrils. Fill your lungs with air (but not to the point of discomfort). Hold for a count of five then slowly begin to exhale through an open mouth. Repeat at least 12 times, longer if you need to.