16 year old in excrutiating pain.?!

It happened Sunday. I woke up at 8 to get ready for work and I did. Then went to bed for a quick nap then woke up in the most awful pain ever. I couldn't get up, roll or move and had difficulty breathing. Everytime I did it hurt in the right side of my rib, mainly mid to bottom and then tighten right across the front of my chest like I was being winded and unable to breathe. My girlfriend who was there noticed and called 999, he took me to hospital and I got checked. I gave urine but refused to give blood test. They said probably a muscle problem but the paramedic who took me said it could have been a kidney infection or worse.

I'm still in pain, I'm feeling sick constantly so I know my bodies trying its hardest to fight something off and painkillers aren't helping.

I fainted the other week and wondered if it could have been that and only realised now or maybe an infection that I should get my bloods checked for?

I've noticed lately that my urine is darker and there is more of it. If that's any help at all.
I'm 16 male.