I am not sure if this is a cluster headache. For the past 1.5 months, I get a severe headache a few times a day. The time is not fixed. Sometimes I get it 4 times a day and sometimes not even once. The headache lasts for 15-30 minutes. It reaches a peak and then the intensity decreases. I have been getting these episodes for the past few years. It happens once a year or two. But lasts for more than a month. I have visited a GP, eye specialist and neurologist in the past. A few years ago CT scan was also done but nothing came out. 20 days ago, I started with homeopathy treatment. Initially the frequency and intensity decreased but now it is the same. I have been suggested an MRI by a doctor friend. Please help.