Thanks for the responses! I've been working there for about a month now. I didn't start noticing these symptoms til about a week ago. I have had a blocked ear (due to allergies) during this time so that definitely contributed to having that off balanced feeling. However, I went to the doctor on Thursday and they cleared that problem up for me. I don't notice the "off feeling" until the end of the day.
My ears pop as I'm taking the elevator up and I usually feel fine. I do notice that the symptoms go away as soon as I get to the ground level though. My only guess is that it could have something to do with the circulation of air in the building and/or my bad allergies and being at a higher altitude.
And yes, Shisslak, I'm definitely not working north of Boston, working in the the city.