Any medical professional?

I have been experiencing pain on the left side of my chest and even went to ER for an X-ray to get it checked. Blood work, EKG and X-ray showed everything was fine but it has been hurting for 2 weeks and sometimes I’ll have chest congestion with difficulty breathing. The pain will shoot to underneath my armpit and periodically my back.

Also, I can feel the pit of my stomach drop. Like, when you’re scared from anxiety and your stomach ties up in a massive knot, like it’s plummeting? That’s how it feels like when I’m simply trying to breathe...

Can anyone please help me, it’s really starting to depress me...I was severely sick a month ago and most of my symptoms are cleared but the chest pain is fairly recent and I want to live a normal life again...