Possible ankle sprain or break, seeking advice

I'm not sure if I sprained or broke my ankle this morning. I was going down the steps and missed the last one. I'm not to sure if I fell on it (it was very early and I don't remember everything) but I heard a pop and it hurt. I took some Tylenol and it seemed to help and I was almost walking without a super noticeable limp. It's started to get worse as the day goes on. Now I can barely hobble around and it I'd very painful when walking. I only took the Tylenol around 7 hours ago. It's also very swollen. I really can't afford for this thing to be broken and don't want to pay for a hospital bill if it's just a sprain.