Forehead pain when doing pull ups

[ohmyholy]

Hi this afternoon, i did pull ups and on the 5th time i suddenly feel a very big pain like pressure on my forehead and does not go away. This is my 2nd time encountering this, as usually when i did pull ups i wont get this problem. The 1st time when i encountered it the pain dissapear after my night sleep.

So what is wrong?

 

[ohmyholy]

after a few day still no reply...