Requesting reassurance for anxiety chest pain.

Honestly i am just writing this so i can actually calm down and sleep. I have bad anxiety for the last 3 years and have been unmedicated for majority of it. I was diagnosed with Panic disorder and somehow still try to convince myself im physically ill. I know absolutely nothing is wrong with me (i think) but still I completely freak out about everything i feel in my body. I have chest pains when my anxiety hits an all time high and everytime i come out okay. I also have fluttery feelings and hard and fast heartbeat sometimes, get nauseous and sometimes dizzy or derealization hits. What are the chances of something being wrong physically or am i just freaking out and working myself up because of the physical symptoms of anxiety? I have never been to therapy and was medicated for about a month that did not end well so im genuinely just winging it every single time. Im rambling someone please just reassure me.