I'm new, but I'll tell you what I know. I love Elavil (Amitriptyline) - it helps with depression, anxiety, irritable bowl, acid reflux, migraines, etc.
Typically it's very sedating - Five years ago when I started out on it, I think I went up by 10mg a night. My current dosage is 150mg - and it remains sedating.
I didn't have any anxiety feelings - like heart palpitations or adrenline surge, but I did with Nortriptyline - I only took that for 3 days and the anxiety was pretty bad. All our body chemistries are different, it may just be that Elavil will have side effects that don't go away for you, or are ones you can't live with. Let you doctor know how you feel, and try not to worry to much.