Not sure what I might have...

But it sounds similar to all the symptoms in these various posts I've been reading.

I work in a solicitors and sit at a desk all day typing. For the past couple of months I have became really fed up and find myself feeling worse every day in work. I actually feel like sitting at my desk is making me ill. Some days I get headaches and feel nauseous just by sitting there. I am fine outside once I get some fresh air or if I'm walking around, but sitting still at my desk makes me feel quite ill.

I am constantly tired no matter how much sleep I get, feel physically and mentally exhausted at work every day, my eyes burn and are extremely heavy, I feel light headed and faint, queasy, and very tearful. My colleagues must think I have a bladder problem or something, because they think I go to the toilet alot, but I really just go to get away from my desk for five minutes, or I go out into the lobby and breathe next to the window for a few minutes.

I really don't know whats wrong with me, but I can't take much more.