My best friend was prone to anxiety attacks with many of the same symptoms: sweaty palms, racing heart, stomache aches, panic attacks etc. She was irrationally fearful of doing certain things (i.e. signaling when changing lanes... she thought people would see her signal, and then intentionally try to cut her off) even though she had done them thousands of times before.

She was prescribed short-term anti-anxiety medication or anti-depressant (forgot which one) which did wonders for her. She was only on it for a few months. She has been free from the anxiety and panic attacks for years now. I'm not a big proponent of medication, but sometimes it's a good thing.