What strikes me about your symptoms are the Autumnal and Vernal Equinox time periods that seem to accentuate your migraines. Why this occurs in you I do not know however, the commonality seems to do with changes in sunlight. If you can tell us what State you live in I might be able to think about the science behind why this is possible.
Eddie
Just try to avoid things that triggers migraine, like getting enough sleep, staying away from caffeine, stop eating yellow cheese, avoid high lights. Migraine can be controlled. U can take a strong pain killers whenever migraine attacks.
I think you need to try out more medications if the ones you have are not enough. You shouldn't have to take steroids this often. Just my opinion.
Hi and welcome to the Migraines & Headaches Community.
Spring and Autumn are high allergy months and allergies do affect migraines.