What's wrong with my foot?

2 weeks ago now, I was doing hurdles at athletics and I think I landed funny. It felt like it was cracking about 3 times each time i landed, and after about 3 hurdles i had to stop. I could barely walk. It was swollen loads for the first few days. After a couple of days my whole foot went blue and my toes had purple lines on them. It has got better to a certain point but I still limp, i can't run and i cannot jump. I can't bend my foot back as far as my other one, and i still have purple bruise lines on the joints to my toes. It also now hurts even when im sitting down, it just constantly aches. Doesn't seem to be getting any better now. Any suggestions?