What does an anxiety attack feel like?

Anonymous
Do I have an underlying anxiety disorder or am I just anxious and stressed?
Did I just experience a mild anxiety attack?

A couple days ago I got a spontaneous small procedure done and got laser treatment on my birthmark to get it removed. I have been looking at it and I am feeling a bit regretful. I'm thinking I should have kept it, or should have gotten it removed a different way. Im scared it will become a scar, Im scared it will get infected, Im scared of what other people will think. I am even scared that it could cause skin cancer.

I went into work today and I constantly kept having bad thoughts. I felt like I was on auto-pilot, and just felt like I was going through the motions. I felt detached from myself, and a feeling of unreality. I kept having an overwhelming sensation that something bad was going to happen to me. I felt like my heart was beating fast. I felt like I've just heard some bad news.

From the outside you wouldn't be able to tell that I was dying in the inside. I did feel restless (i''m not sure if it was from a long day of work or from anxiety).

Do I have a rational reason to be worried? Was I just stressing out?
What does an anxiety attack feel like?
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