I've been feeling really apathetic

I've been feeling really apathetic ever since the start of spring break.  If I've learned anything from the past two weeks, it's that I've never relied on my emotions to get work done and complete day to day tasks.  This means that I show almost no physical symptoms of my emotional change.

I wonder if I've drunk too much alcohol or if this is just a part of growing up.  Maybe this is the result of my bad diet, since I haven't been eating much vegetables or fruits lately.  Whatever the cause, I feel like my mind has been copied, the original discarded, and the copy put into the shell of my body.  I feel like I've lost something that made me human two weeks ago.  I feel like I've lost my sharpness and clarity of thought.  Is my brain fried from a stressful quarter?  I don't feel concerned even though I should be because I am apathetic.

I have a hard time comprehending what I see.  It's as if my emotional center of the brain has been detached.

Edit (4/25):  I may be transforming into a sociopath.  My apathy seems normal and permanent now, but reading my past posts, I was clearly not the person I am now.