You know that you are Cold as ice

So today I went back to work, but when the sun started streaming in my window, the combination of that and the pain in my head/neck made me want to throw up. I am not one to normally be prone to nausea, so although I'm not one of those weirdos that will do ANYTHING to keep from throwing up, I am still a bit alarmed when I feel like vomiting and there's not a good reason (or quantity of food/booze) to explain it.

To compensate, I opened the window, letting a little 21-degree air in -- that plus a little ice water helped stave off the nausea, but it made my office SO COLD that I could only keep the window open for a short while. Then close it and get nauseated again, then open it and freeze, etc and so forth. Hey, you don't think this continually-changing temp thing could be making me sick in any way, do you?

People kept coming in asking "Aren't you cold?" and "Why is it freezing in here?" -- each time, I had to explain why, and really did not want to. Something about saying the words makes it real. No likey. Finally at about 3pm I could not stand it anymore and left. I should have frankly left prior to that, but did not want to look like a slacker. [Yes, I am this dumb]

The cab ride home was touch and go. Every bump and shimmy in the road went right through my skull. I had to start long hard breaths to keep from vomiting or passing out. I came upstairs and fell into bed -- luckily the house was cold, so I felt better (if not well) fairly rapidly.

Am getting worried that I'm going to have to go to the hospital for this thing, given that this is day three. How many days does one go on with something like this before you need a shot of something?