In the past 10 days ive been getting lots of headaches & migraines. i had an brain mri a year ago due to the same reason and everything was fine. but now, the headaches are coming back. could it be due to the weather or this specific time of year?

It could be: You can take comfort in knowing from the MRI that your headaches are medically benign even if they can put a major dent in your life. Migraine symptoms are idiosyncratic for every migraineur. There are reputable websites (e.g. headaches.org) with good information about patterns of migraine symptoms, tips for managing them, & migraine-related social media. I recommend checking them out.