I recognize that Reddit is not the place to get a proper diagnosis but I really just want an idea of what’s going on with me

The other day while I was watching TV I began having chest pains. My vision started to go out, the TV started to sound kinda muffled, I couldn’t breathe well or walk straight. I thought I was having a heart attack or some medical emergency. It lasted maybe 20 minutes. It happened again later that same evening. I called 911 in both instances but later felt guilty for wasting their time. Ever since I’ve been having chest pains and if I think about them too much it starts to exacerbate, so the majority of my time now is spent trying not to think about the thing that’s constantly on my mind. Wonderful. I feel like I’m just trying to avoid another possible panic attack at this point

I’m not the healthiest person diet wise and I haven’t been for the past few months due to Covid and quarantine. Additionally, I recently went through a stressful several month long job training (and passed!). It was awesome for a bit but I had to move across the country away from home. I’m pretty isolated out here and haven’t met anyone really yet. I imagine that these could be stressors?

I don’t necessarily feel anxious in my day to day, but my friend told me anxiety can manifest subconsciously through overthinking and rumination. I guess I never really thought that all of my recent life changes could be having an negative effect on my mental health. I’m wondering if anyone else has gone through something similar or if this doesn’t sound like anxiety and is more serious