I think dislocated my knee cap. What do I do now? ?

I turned into my couch, twisted my right to the inside, something fell apart cause it hurt and I fell to the grounf, whatever it was popped back into place. It's been 12 hrs since. I have no ice, no brace. Can't go anywhere for a few more hours or even a day. My knee was feeling only a little sore 1 min after the twist. I started readi g up and put it in a extended position. I was able to stand/ walk on it to get food 20 minutes after. Then it started hurting. Now its loaded with fluids around the knee area. I have it slightly raised on the edge of the couch. Bending it relieves pain. But I can't bring it in to the back of my thighs . Near there it hurts. Extended it hurts a small amount constantly. Now, what should can I do? I also want to know if this cqused irreversible damage to my leg makjng me unable or hindered at sports. Mainly airsoft and weapon martial arts ( german longsword ). It's the handicap of permanent damage that scares the hel l out of me. Losing15% of ky leg strength and being susceptible to more of these painfull, time wasting, strength shrinking events.