Strange chest pain, weakness, etc.?

A little less then a week ago I had what I think would be called a panic attack. Racing heart, dizziness, nausea and of course, a sense of impending doom. In the moment I diagnosed myself with a heart attack but my spouse calmed me down. A few days later, however, I was out walking my dog and suddenly felt very dizzy. Thinking it was another attack I went home and sat down to calm myself down... But my symptoms haven t really improved. The anxiety has mostly passed, but I still feel somewhat dizzy... Accompanied by an on-and-off - and very slight - chest pain. I ve been experiencing these symptoms for 2 days now without much change. I m female and 20 yrs old with no other existing conditions. I ve set up a doctors appointment but would like some insight in the meantime.

Thanks