Ankle sprain

I was exercising and turned my ankle. It didn’t bother me right away. It started hurting me 2 days later while walking my dog. It hurt so badly i could barely get home. It was swollen and i could barely do anything. IT’s been bothering me all week, is still swollen, and hasn’t gotten any better. I have sharp sudden pains, then it throbs, especially when i move it a certain way. Ive been wrapping it and icing it all week, and trying to stay off it. it’s been bad though, and not getting better. I also have to carry 30 lbs of books every day during school, so that makes it worse. What more should i do? How long should a sprain take to heal?? Any other advice on what i should do?