Effects of Long Term Sleep Deprivation?

I am actually afraid for my health. I am about to graduate from college, but I wonder *what* of my physical, mental and possibly neurological health I have sacrificed to get it... See, I have been in college for almost 8 years- from when I was 18 to now (I am about to turn 26).

As an art major, I have had to pull all-nighters working on projects on a regular basis- at least 1-3 times a week (now it's 2-4 times a week in the last two years), EVERY week of a semester. ...Since 2003. My only breaks have been summer and Christmas. You can do the math from there. The effects this has had have been becoming increasingly scary.

As a result, I have had to deal with (in no particular order):

anxiety, gastrointestinal problems, depression, vertigo, "migraines" (VERY sharp, sudden painful headaches, hallucinations- both visible and audio (only happened if I went 30-48 hours without sleep), stress headaches, depression, VERY low immune system (multivitamins helped bring that back up a bit- before, I could not go into a crowd without catching God knows what), inability to concentrate, irritability, memory loss, a MUCH shorter attention span (I can't even watch TV for more than 20 minutes without getting bored/distracted/losing interest.), I can't focus on anything for too long, feelings of numbness in limbs, weight gain, high blood pressure, extremely tense and painful muscle knots in my shoulders, unpredictable change in body temperature- anywhere from 95.7-98.6, and most recently, I learned I have anemia- brought on by my every day coffee consumption (during the semester) that made it difficult for me to absorb whatever iron I was getting (I can't eat red meat as I can't digest it). I now get random pains throughout the body- chest pains, headaches, back aches, and then some.

Most recently, I have had to deal with getting dizzy off of sugar, vertigo that feels like elevator dips if I have caffeine and/or energy drinks, or if I do something too fast, all effects of anemia- light headedness, chest pains, fainting, weakness, etc, hallucinations if I go more than 19 hours without sleep (at least the voices can harmonize...), weird smells o.O, migraines (sharp painful headaches in certain spots that may go away with change of lighting), inability to focus, and impaired memory. :( among other things I honestly can not remember to list at the moment.

I also have NO health coverage.

To stay caught up in my classes, I would have either needed a time machine, or simply get 4 or less hours of sleep a day- weekends included. My body has simply not been able to do it, and my grades suffered accordingly. I have been at a race against my body to graduate so I don't freaking collapse or actually suffer some kind of permanent damage.

....And that is exactly what I am scared may have happened. Moral of the story is, don't get an art degree if you value your cognitive abilities. But,

Is everything I have been experiencing just a result of long term sleep deprivation and stress (High stress, low sleep lifestyle), or, is it possible that I have seriously shortened my lifespan, or am going to have some kind of permanent impairment. I plan on taking a 6 month hiatus from ALL major projects and get onto a 7-8 hour sleep schedule, but, is it too late? Or will symptoms go away with time? I can't pretend I am not scared.

Thanks in advance.