I don't know why this started. It was worse when my thyroid med was too high, plus I had horrible insomnia, but now the dosage is about right I think.. I'm sleeping, feeling better, but don't want to leave the house. I have to go out... I need dog food, water, milk, etc... Why am I afraid? I'm retired from law enforcement, plus used to drive city bus. I was fearless. What is this? I hate it!