Do you feel super nauseous as well??

Yeah I have all that, but I think my POTS and ASD work together to make things more intense.

Any specific triggers? I get the same thing often during/after standing or changing positions, also if I am stressed

This could be a vasovagal episode as well. But always good to run it by your doctors and neuro.

I get those whenever I stand for longer than 10-15 minutes. The brain fog is especially hard to deal with, but none of it feels good. If you can get a diagnosis and medication, great. If not, try upping your salt and water intake. My doctor has me drinking at least 100oz of water a day and taking 6g of salt in the form of Vitassium Salt Stick tablets. I take 6 in the morning and 6 at night. They have helped me tremendously.