Amitriptyline

My doctor put me of 50mg of nortriptyline for nerve pain. Didn't do anything. Switched me to amitriptyline 50mg at night. Been taking it about a week. Still don't notice any pain relief. Is it supposed to take a bit? I just want the pain to lessen a bit. Not on any opioids because that's to reasonable for the doctors, so they are trying all these meds with pain relief as off label use.