Is my ankle broken or sprained?

So I was at the gym last night and went to step off of the treadmill and my left ankle rolled in and I landed on it. I felt it crack like a zipper like 4 times. It hurt bad for about two minutes but then I was able to walk on it and walked on the treadmill for ten minutes with mild pain nothing horrible. I’ve been icing it and elevating it and now I can’t walk it hurts so bad this morning. I tried walking to the bathroom twice and I got super nauseas I’m assuming because of the pain. I’ve touched the bones around my foot and ankle and they aren’t sore too touch. Doesn’t look discolored or anything but it’s so damn painful. I just had shoulder surgery so I’m hoping it’s not a break. Any input ?