Tight heavy feeling in my chest. Like it's been binded tightly. What could this be? I can't take in proper breaths and I have been dizzy?

Shortness of breath and chest tightness usually comes from anxiety. But sometimes it just comes out of nowhere. I get it from time to time, and have learned that thinking about it makes it worse. I usually just go for a walk, or watch a funny movie - or play with my pets. It goes away in a couple of hours. But sometimes it's a sign of allergies. Sometimes you can develop an allergy for something that you used to be fine with - like nuts or shellfish. Pay attention to what you ate recently, and see if it happens again.

No big deal. It's just The Alien starting to burst through your chest.