Clairaudiance headaches

[javier_otto]

So I've been performing the meditation to open the points of clairaudience, and I had to stop after six minutes of it because I started getting a nasty headache, what would be a good way to pace myself so I don't hurt myself? I wasn't even able to complete all the points before this rush of migraine hit me.. 
Hail Satan and the Brilliant Ones of DUAT!!