Doctors only please help?

So I'm a 15 year old girl and I haven't been feeling bad, just weird. It started on Monday.

this are my symptoms:

1. Total loss of appetite (I mean my stomach hurts from the hunger but I have to force myself to eat)

2. Extreme thirst!

3. No poop

4. little pee (comparing how much water I've been drinking)

5. a lot of gases

6. Sometimes I have a weird taste in my mouth

7. My belly seems to be getting bigger

8. NOTHING hurts



I started keeping track of what I've eat and well defecated LOL

this is so far:

yesterday:

1st pee: around 8PM.: yellow

2nd pee: around 10 PM: really light yellow

NO poop

I ate:

1 cup of milk (200 ml)

1 1/2 hot cakes

1 hamburger (with only 1 meat)

2 pieces of pizza

My mom made me eat



Today so far:

1 pee: yellow : approx 12 PM

I ate:

half a cup of milk with sugar



*the food I've eaten is really few comparing to what I normally eat

It's weird

help?? what should I do, I already told my mom, but shall I worry?Doctors only please help?
Are you sexually active?

Never rule out pregnancy.