I have not tried Trazadone, but have been on similar drugs. Trazidone is like any other tricyclic antidepressant, they all have side effects. Main one tends to be weight gain, and some studies have shown it might increase your diabetis risk. They also tend to increase triglycerid levels, which is part of the colesteral profile.
Have you tried benedryil/dyphehyramine? I found it works just as well as the prescriptions. We all hate to not to be able to sleep when we want too. Its all part of the grieving process. Its been 8 years sinse my son died, but there are still nights I don't sleep, even when taking something.
Love and Hugs
Peggy