According to this drug interaction checker there are some interactions, so definitely ask your doctor or pharmacist for their opinion.
http://reference.medscape.com/drug-interactionchecker
The serotonin interaction for amitriptyline is a very rare possibility called serotonin syndrome. It was a possibility of an interaction for a drug I took with amitriptyline but neither my doctor nor pharmacist were worried about it, and I had no trouble with it at all.
I'm not sure what the QTC interval means.