What’s wrong with me? Details inside? Help?!!?

Kat Asked: What’s wrong with me? Details inside? Help?!!?

Okay, so on 23rd December I finished my period (2nd time having it) And since the 24th I have been feeling really unwell. At first it started with a light headache and nausea, then eventually got worse.
I've been feeling really achy and tired and felt like I was going to be sick, and I had pains in my sides and my lower abdomen. Seriously. My brother said I'm really really difficult to wake up (literally he tried to wake me up to check I was okay. He said I wouldn't wake up even if he punched my shoulder)

I also have this thing where I'm hungry, but I don't feel like eating.
What's wrong with me? Last Tuesday I sent off a urine sample to check for a suspected UTI….
OR…
Is there a possibility I could have worms? Because on the Thursday I began to feel unwell, I was cleaning up my cupboard and I had shift my kitten out of the way. There was a little white squidgy thing, about a centimetre long. It wasn't moving or anything. I picked it up and threw it away (It DID NOT bury into my skin, I swear) and I washed my hands straight afterwards. My kitten has not been de-wormed and even though we wash our hands after we pick him up or before eating, I still feel ill. My mum and dad pick him much more than I do and dont wash their hands, but they're not ill?

Please, whats wrong with me? I'm in so much pain it's unbelievable. I wasn't like this after my first period!
PS: I'm also having a little bit of trouble going to the toilet, but I will admit I dont drink enough water (I only drink like two glasses a day and I don't eat very much, and when I do, it's usually sugary. I'm pretty healthy and slim though)

Help me. I'm 13 years old and female if that helps xx

EDIT: Also, I'm really irritable and anything will just annoy me. Such as my pets eating (they make little slapping noises with their tongue) or EVEN MY PARENTS will annoy me. I've never felt like this before….

I've not had sex so I'm not pregnant!!!