Sprained Ankle??

I’m a 17 years old and I have recently sprained my ankle. I went to the hospital to have it x-rayed to make sure it was not broken and after a long wait the doctor told me it wasn’t broken and it was just a sprain and to come back in a week if it got worse. My problem is that I have had sprains before, and never has it been like this. I have to put all my weight on the inside edge of my foot because straight down or on the outside especially, results in a rolling of somthing in my ankle as well as a sharp cracking or popping sensation. I have never had a sprain crack and pop before and just the idea that it can still happen a good two weeks after the fact is unnerving because everytime it happens it hurts quite a bit. The pain has lessened over these two weeks and I realize bad sprains can often take much longer to heal. The sensitive parts of my foot seem to correspond remarkably well to a picture of the ligaments in a foot I found. The anterior talo-fibular ligament, calcaneo-fibular ligament, and posterior talo-fibular ligament all seem to be the sore places. Basically what I would like to know is A) What is cracking/popping? B) Does this normally happen with bad ankle sprains? C) Will it stop/What can I do to help make it stop. D) Will I need an ankle brace for sports form now on?