What does pneumonia feel like?

I don't have health insurance but I went to urgent care on Tuesday. (It was a nightmare and I waited for 2 hours before I got passed around by nurses and doctors.) I went in for a persistent cough, congestion, fatigue and chest soreness. They said it was walking pneumonia and that I could take antibiotics or it would go away on its own but now it's Friday and my chest still feels like I can't take a deep breath. It's sore and achy and I'm getting tired/a little light headed if I'm up and walking around too much. Since I don't have insurance I'm trying to see if this is normal with walking pneumonia before I go back.