This first occurred to me about 2 years ago and has recently popped in my mind
I went through my neurology records, and for many years, it seems I had made appointments in the late April/May/early June timeframe. For many years in a row. I only make an appointment when my symptoms get worse. Those months are prime allergy months (in the northeast at least)
I was told at some point in the past that allergies symptoms can decrease a migraine sufferers resistance to migraines. It usually took about a month for the increased sensitivity to wear off. Anyone else have worse symptoms annually around this time?