I get auras without headache as well. I do not take any medications because I am generally sensitive to them, and my migraines aren't that frequent. I also have "vestibular" migraines that cause veritgo/dizziness. That could be something to ask about-?

Tilt table test determines if you have POTS, and whether your blood pressure goes down followed by faster heart beat when quickly going upright. Do you pass out when you get up from sitting or lying down?

Is your blood pressure low? You can buy a cuff. I have low blood pressure and make sure to hydrate a lot and eat salty things. I have a cuff at home.

Have you been tested for Lyme? A little out there but an idea from my experience!

My kid was sick like this in their teens and are thriving now. Just to give you hope. You kind of have to take one symptom at a time, one step at a time. A functional medicine or integrative medicine could help too though they might cost.