“Anxiety, reflux, chills, tightness in throat and chest, pain?”

I've been having chills, shaking some, feeling a dizzy, some pain in the chest, with tightness in the throat as well. I've taken omeprazole a few weeks ago, as prescribed by a doctor for reflux. Went to the ER twice, about a month ago, and nothing wrong with my heart or anything, but they suggested I may have anxiety. Could anxiety be causing all of these symptoms? I was prescribed hydroxyzine in case of an anxiety attack. I don't appear to have a fever, so I 'm doubting it's COVID-19-related. I started feeling like this last night, and before that, it was maybe 4 weeks ago when I felt this. Is this some sort of an anxiety attack, or caused from reflux?