@JTL Its Intel HD graphics and ATI Mobility Radeon HD 5650. I know the driver for the radeon is not working properly, because I cannot open the properties, it doesnt show in running services and I cannot open the "switchable graphics" window under right click on desktop. However the card is in use in Photoshop.
It was not painful when I got the computer, or during the years I have been using it. It must be faulty driver therefore. When I disable it and use the Intel one only, all is good. I feel both really unlucky and lucky now, because this proves to me that drivers and software is to blame as well. But that has been already proven and discussed on the Intel forum too.
The pain is different, its annoying and it again feels like the screen is moving and I cant really focus properly. Its the typical head pressure, but it fades soon when I am not exposed to the screen. As opposed to PWM, which really persists for hours after with random stings behind my eyes.
@ryans Ditherig wont work, as it only works on Intel I suppose?