I have also used nortryptaline in the past for insomnia, its an anti-depressent that can help you sleep. Its hard to get off some meds, but if you were to split up your pill in half then this will make it easier to get off it. I definitely would get off all prescription meds before getting pregnent.
I also would get your immune system much much stronger before you do something like this because the baby is going to further cause nutritional deficiencies, etc. You just barely got better and a pregnancy will basically suck out anything you have left. Considering how quickly your symptoms came back after stopping sf722, I don’t think you are quite there yet.