How can I remove odor that causes throat irritation and headache?
I'd suggest first determining what is causing this. Is it the window glazing? Is it the paint? 

If the glazing, then have the glazing redone. If the paint, then you will need to strip it down, not try to cover it over.

One thing that would help is to have a test done professionally. This can be expensive, but it would help, not that I know who would be able to do such a test. Another option is to remove a piece of the painted drywall. Put it into a sealed airtight container overnight. Then when you do not feel any problems, stick your head into the box, and breath deeply for a minute or so. If you have a problem, then you know where to look. If no problems, then I'd do the same with some of the window glazing.