Strange feeling in head - or have I lost it?

Good evening all.
I have a very strange feeling in my head!
When I put a very light cap on the feeling was horrible - like a pressure pain. It was hard to believe the cap (very light) could possibly cause this really nasty feeling which lasted for at least 10 minutes after I quickly removed it!
It felt that it might have had something to do with vision and looking up to see over / above the peak.
Has anyone else had this / recognise this strange feeling?
Or have I finally lost it!!! :roll:
Have a pleasant evening and sleep well