Welcome to the site ESR
Yes, it can be quite a challenge to wean off this drug for sure. I did some quick looking into your situation and here is what I found. The drug incompatibility was my biggest concern. Please let us know if there is anyway we can help.
https://dailymed.nlm...dience=consumerFDA approved drug insert for nortriptyline
Use in Pregnancy
Safe use of nortriptyline hydrochloride during pregnancy and lactation has not been established; therefore, when the drug is administered to pregnant patients, nursing mothers, or women of childbearing potential, the potential benefits must be weighed against the possible hazards. Animal reproduction studies have yielded inconclusive results.
https://www.drugs.co...tic_duplicationInteractions between your drugs
Major
nortriptyline and DULoxetine
Applies to: nortriptyline, Cymbalta (duloxetine)
Using nortriptyline together with DULoxetine can increase the risk of a rare but serious condition called the serotonin syndrome, which may include symptoms such as confusion, hallucination, seizure, extreme changes in blood pressure, increased heart rate, fever, excessive sweating, shivering or shaking, blurred vision, muscle spasm or stiffness, tremor, incoordination, stomach cramp, nausea, vomiting, and diarrhea. Severe cases may result in coma and even death. You should seek immediate medical attention if you experience these symptoms while taking the medications. Talk to your doctor if you have any questions or concerns.
https://www.ncbi.nlm...pubmed/11243492The aim of the present study was to investigate the transplacental transfer of amitriptyline (AMI) and its main active metabolite nortriptyline (NOR) in isolated perfused human placenta.Both AMI and NOR cross the human placenta. However, the fetal exposure with NOR may be somewhat smaller compared with AMI, probably due to the higher lipophilicity of AMI.
https://www.ncbi.nlm...les/PMC3973612/The TCAs nortriptyline, clomipramine, and their metabolites pass readily into umbilical cord serum in in vivo studies (Loughhead et al., 2006b).
Weissman et al. (2004) conducted a large scale meta-analysis of 57 studies that examined mother-infant breastfeeding pairs to determine the amount of antidepressant exposure via lactational transfer. Overall, nortriptyline, sertraline, and paroxetine usually had undetectable concentrations in infant serum.