Meditation and Nausea/Motion Sickness

[Raptorsin7]

Has anyone experienced a link between self-inquiry meditation and increased nausea and motion sickness. Recently i've had pretty bad motion sickness from riding the bus to school, and i'm thinking it might be related to doing self inquiry meditation where i try to turn attention basically to my eyes/behind my head and it usually gives me a weird headache. My diet also sucks so i'm thinking it's probably that but i'm curious if any other people have had this experience meditating.