Help! Extreme Weight Loss Problem?

Alright so at the beginning of the semester for school, I signed up for this class called Advanced Sports Conditioning, because I played football. You just lift weights all class period. I also have Intermediate P.E. right before that. Our class is on a block schedule, so I’d only have those two classes on “A” days and no P.E. or weight classes on “B” days. Prior to this class, I have not been able to gain a pound less or a pound more than 145 lbs. That’s how much I’ve weighed since I was about 15. (I was 16 at start of class, 17 now.) My body fat percentage was 5.3%, about average.

I didn’t do anything special, I didn’t do any extra activities (except heavy lifting at work, at my grandmother’s farm), I didn’t go on any diets, nothing. Well, recently I decided I wanted a six pack and started doing 50 crunches on my Ab Rocket a night. Here is my diet:

Normally, I’m running late, so I skip breakfast. Once every couple days, I will either stop at McDonalds or Carl’s Jr. on the way to school, or just have some cereal.

I can’t afford lunch at school, so I just wait until after school (Get home by 2:30-ish), then have a big plate of popcorn chicken, bananas, mozzarella sticks, corn dogs, Bagel Bites, cereal, whatever I feel like.
Sometimes I’ll scrape up enough money to go to McDonalds and get a few things off the dollar menu, but not enough to fork over $5.00 at school everyday for lunch.

Then I’ll eat dinner (either my stepdad cooks or we go into town to eat something). Then I eat dessert, and right before bed I go downstairs for a bowl of cereal or something.

Yeah.

So anyway, it’s coming up on semester finals, and we’re measuring body weight and statistics…. I only lost a half pound, but my fat percentage Bank Routing Number Citizens State Bank Nya went down from 5.3 to 3.5. The following class, I tried again, and this time I lost 5 pounds and now my body fat pecentage went down to 3.2. I then weighed myself again on my scale at home today, and I lost another five pounds. Now, even after school between “lunch” and dinner, I’m always feeling hungry, and I’ll eat, but I keep losing weight. What should I do?
Seriously. If I don’t do something soon, poles are gonna become a really good hiding place in Hide n Go Seek.
I don’t know if the class is over I think it’s a year long class, I’ll have to check and see.