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The air conditioning is often set to "off" in my appartment. I've payed careful notice, that whenever it's been off for several hours, I not only feel fatigued, but I also feel feverish (in the head). The fatigue and feverishness subsides when I turn the air conditioning back on. I realize that there can be many factors in causing physical fatigue and fever, but I'm absolutely positive that the air has something to do with this. (About seven years ago, I developed blepharospasm whenever in a low-oxygen environment, but I do not think that is related to this issue, because I do not develop blepharospasm anymore.) Is the air in my appartment bad?? What is it about air conditioning being "off," that could be making me suffer?

If the air conditioner is exhausting to the outside it may be venting something toxic. Do you have new carpets or curtains?

I don't have a new carpet and there are no curtains in my room.
Other than that, I don't understand your reply "If the air conditioner is exhausting to the outside it may be venting something toxic." Could you explain?

If there are toxic fumes (from something like a carpet, for example), or perhaps something you are allergic to in your apartment and if the air conditioner fan blows that stuff out of your apartment, it may be saving you the trouble of experiencing it. If the AC then goes off, that material could build up and cause toxic or allergic effects. It's a possibility. See if it fits.