Is it possible to drink to much water? I feel like i'm drinking 2 gallons a day, is there a limit?

Yes -- but it's rare:

http://chemistry.about.com/cs/5/f/blwaterintox.htm

I knew someone who was drinking 3 gallons/day and went to the doctor who told them they had diabetes. I believe that a constant thirst might be a symptom of diabetes.

In fact I just checked and these are some of the symptoms:

# Frequent urination
# Excessive thirst
# Extreme hunger
# Unusual weight loss
# Increased fatigue
# Irritability
# Blurry vision

I don't think the person I knew had any of the other symptoms.

Crap!

# Frequent urination - got it (cause I drink over a gallon of water a day)

# Extreme hunger - got it (eat a lot too)

# Increased fatigue - got it (sleep pattern sucks, work too much)

# Irritability - got it (irritated cause my abs are not better!!!)

# Blurry vision - got it (when I stare at the computer too long)