Leg swollen pain from knee cap down to foot

Idk if this is where I put this kind of thing but

I was hosting a block party with my mom yesterday and was on my feet from 3pm to 9pm. On the ride back home i felt my right foot stiff up almost as if I was gonna catch a cramp but my bf massages my feet and it felt a little better less tense. It’s like 4 am rn and I go to use the restroom but I wake up in pain. My right left is swollen from the knee down and the pain is radiating up and down from my knee to my ankle. I’ve always had knee pain since middle school and told it was growing pain. I’ve played sports since elementary so as I got older I thought maybe it could be from years of falling running etc? I’m 20 now and the pain just gets worse. Now I’m thinking it’s arthritis in my knee ? Idk what to do rn bc my toes are swoll everything is and I’m in pain. It’s like a sore feeling but also throbbing / radiating ? Help me understand , could this be from standing and walking around outside all day? Anyone go through this ? It’s elevated rn and stretching feels amazing but when I stop the pain comes back :(