Sick - strange - I don’t have a clue

So for the past 2 weeks or so, I’m always tired. I’m not over exaggerating or being a teenager. I’m overly tired and I can’t do anything - no matter how much sleep I get. I’m also dizzy every day especially when I’m exhausted.

When I do sports or even walk up the stairs I feel so sick and like I’m gonna faint.

I went to the doctors, they asked me about my periods to see if I was anaemic, checked my heart to see if it was irregular, checked my lungs to see my breathing, checked my weight AND my height.

And yet nothing came of it.

They said if it’s still like this in 2 weeks then they’ll give me a blood test. But I’ve never felt like this, I’m not on my period or anything.

Oh and to make it worse, I had sleep paralysis for the first time a couple days ago! Just a tall man in a hat at the end of my bed, kinda like a silhouette. Although it wasn’t actually that scary it’s still irregular, and I wasn’t able to tell the doctor because it happened after.

So... anyone got any ideas about what I have? Looking it up, my best idea was that I have CFS (chronic fatigue sydrome) But I hope I don’t.

Please helppp