Anxiety or heart issues? Please help

Okay so for the past few weeks, I’ve been having a lot going on in life. And have some stress. Frequently I feel like I have to keep reminding myself to breathe and I keep taking really huge breaths. There was a period of time

A few weeks ago I felt like I was always tired.

And now last night I woke up with a really heavy feeling in my chest and now this morning it feels my my chest muscles into my arms are sore. Is this all from the stress/anxiety? Or does this sound like a heart issue? I don’t have money for the doctor copay so I wanted opinions. I’m 22 years old, have not been diagnosed with anxiety but I’m always worrying about everything.