Hello, I have a pattern of headache where I usually get once in a year for a period of one month. The headache is too painful in one side and mainly around the eye. one of my nostril gets blocked during the headache. The peak ache will last for 20 mins and the overall headache will last around for 1 to 2 hours and then goes away. The headache can appear suddenly any time in a day or two. During that ache time, I am unable concentrate on my work due to the pain. When I checked in internet, I knew that this headache is known as cluster headache based on the above symptoms. Is it true? Can I know whom to consult and get the treatment for the disease.