My anxiety will last for hours at a time.  I don't have strong physical symptoms, like feeling I'm going to die or have a heart attack.  All the problems are focused in my mind.

I will be tense, with strong paranoia or feelings of prosecution.  My mind will ruminate.  All my thoughts will be painted negative.  Even simple tasks will feel overwhelming.

After it passes I will sometimes wonder what I was reacting so strongly to.