Amitriptyline
"I too have always been anti medication. I've had extreme panic attacks for decades.  I managed to get my panic in order on my own to a degree, but due to high stress at work for a long period, it came back in the form of hypercondria. I have invented almost every illness and was spending thousands on tests to put my mind at ease.  I started getting shooting pains all over like nerve pain.  I thought it was MS, but mri said otherwise.  Doc put me on these for the pain, but secretly think she wanted to try and medicate me for anxiety, which i always refused.  

Give it a few months people.  Im only on 10 - 20 mg a night, but after these months gone past, I've noticed I'm no longer obsessing on irrational thoughts. Good luck!"