For the last few months, I have noticed a feeling of pressure inside my head. I've described it to friends as feeling as if someone had pumped air into my head using a bicycle pump or something. I have no headaches, the pressure is painless, and is most frequently behind my eyes, though I have felt it further back in my head as well. I began taking Celexa (citalopram) in august, so I was thinking it might be a strange side-effect of the medication, but I'm not sure. I've also heard it could be migranes. If anyone has any idea what this could be, I'd love to know! thanks!