When my migraines started getting worse, I also had to learn how to deal with all day long computer use in a new way, as I'm a freelance graphic designer, and I started suddenly getting more migraines from staring at the screen! Do you wear glasses? That ended up helping me. I got glasses specifically for the computer, for close vision and to reduce the glare a bit. Another option is a glare screen or filter. Adjusting the brightness and contrast settings to a lower setting usually helps, too, you'll have to play around with them a bit to find what works best. Also make sure no lights or windows are directly behind your screen, causing any glare. Good luck!