What do I do about a panic attack?

So I am having a panic attack trying to figure out how to walks across the street. So basically I have social anxiety and I be feeling like people in their cars stare at me so I have spent 3 hours on the sidewalk trying to figure out if I should walk across the street. People are looking at me like I'm crazy but I don't care even as an adult I don't even know how made it out of the house. I'm not even kidding I have been stuck in the same spot standing on the side of the road trying to figure out if I should walk across. I manage to get halfway there and not only did some car almost ran over me but I embarrassed myself by running back the way I came from and everyone in their cars were looking at me and people on the side of the sidewalk were staring and laughing. I don't know if I should call a hotline to help me get through this but I literally am in my 20's and I have anxiety so bad I sweat badly if someone even looks at me. I have been making eye contact with other people

What do I do about a panic attack?
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