PLEASE HELP!

I literally JUST fell down an entire flight of stairs in my house and am in a lot of pain. I feel so dumb about how I got hurt though – I’m only 23, and I fell down the stairs. I don’t want to go anywhere or tell anyone, but I heard a crack from my ankle and I fell straight on my knee – it felt kind of like something wrenched. Now from the middle of my thigh down through my foot on my left leg is swollen. It hurts so bad, please give me some advice! I definately cannot bear any weight on it, I crawled over here, scooching bacward… Please someone let me know what I can do? Is this just stupid? I’m sorry for sounding so whiny – I’m just getting very scared – I haven’t ever felt so much pain before and I can’t afford a dr. or medical bills… please help!feel free to email me too.