Trazodone will help you with insomnia and may precipitate withdrawal earlier if that's what your looking for (it's a strong antagonist of mu, sigma, and kappa opioid receptors), but I'm not clear on how it would help you taper yourself off. If you're looking to try something that will help you taper by replacing the heroin with another opioid agonist your best bet is probably kratom. It's a completely unscheduled herb that you should be able to get fairly easily online. It contains a significant quantity of mitragynine (a mu and kappa opioid agonist), and so it should let you control most of the symptoms of your withdrawal, but for some reason it doesn't tend to carry very many of the risks of pulmonary edema and respiratory depression that most opiates do. By itself it's reasonably good; be careful about mixing it with modafinil because the subject of a case study (43-year-old man trying to kick a 10-mg-SQ-a-day hydromorphone habit) apparently had a seizure while doing that. My advice to you is to use kratom to get the opiate use down to a bare minimum, then start backing off the meth once you've got the opiates under control.
