Dealing with Brain Lesions and Migraines

So backstory, I've been having headaches for the last 4 years. It's always on the right side of my face, above my eyebrow but ends at my hairline. it's just a small spot but it hurts a ton. Nothing is working so my mom took me to get an MRI. They did the MRI after 2 years of begging, they found a marble sized lesion on the left side of my brain near my ear. I got contrast done and it showed 20+ small lesions in my brain. Doctor do not know what it is. They say it's air bubbles on my veins that are causing it, one doctor said cancer, most likely stage two but that it was hard to tell with so many but all of them say that the 20+ lesions are not the cause of my migraines. they only measured two and one was 3 pennies long and 1 ½ pennies wide. the other was two pennies long and a half a penny wide. Now, I am getting another MRI in 2 weeks but they say they don't expect any growth to be of concern. They have done no biopsy or any other tests. anyone else deal with this type of thing and if so, what did it turn out to actually be?