i struggled with it a lot from an early age. the only thing that helped me during school was being able to have extended deadlines for assignments and being able to leave class if it interfered too much for me to focus.

you could try some grounding techniques (do a google search for that) if you haven't already tried some.

i personally didn't find much that helped lessen it. mine was all trauma based which was also related to certain diagnoses with a mix of other symptoms, so it wasn't just one thing by itself. it was more time that was the factor in it lessening for me. everyone is different though.

i don't think meds can help with it though. sometimes, they also can make it worse.