This hurts! Is it normal?

Hi, so I slipped on a wet floor and was told I sprained my PCL at the ER. This was 4 days ago. I've been following the regimen of keeping it wrapped and using crutches to take some strain off it as well as taking ibuprofen as well as another prescription pain med. I've noticed my knee seems to be popping at times and when not wrapped for a few hours (at night) it feels heavy if I go to stand up to go to the restroom. There are also random muscle twitches associated with it. Anyone else experienced these symptoms with a knee sprain?