Good Evening. Had Severe Headache Attacks For Some 30yrs Now.Seen

Good evening. Had severe headache attacks for some 30yrs now.Seen Doctors but no diagnosis given. Attacks generally occur about four times per year and are preceded by a blister type spot, always on the left of the face next to the ear or the upper left lip.Spot becomes sticky and inflamed.From this,I know the severe headache is to follow. I have considered Migraine and Neuralgia as causes but don't think It's those. Headaches last about five days,spot gradually dies away.Left eye is affected during these attacks (Blurring).Headaches can be quite excrutiating at times.Last attack was one week ago. General health is good. Age is 63, Male,non-smoker,non-drinker.Retired now. Thankyou.