I think your big problem is mixing the cold meds with the Trazadone. Trazadone is frequently used as a sedative, taken at bedtime to fall asleep easily. I take it myself for that very purpose. If any of your cold meds have anything like benedryl in them, that would be a big no-no. By the way, are you on any Prescribed pain medications that are narcotic in nature? That would be a very bad cocktail. My best advise is to call the closest 24hr pharmacy and review all the meds you are taking with the pharmacist. Don't wait at all. Medicine interactions can be deadly, even in seemingly small doses.
Let us know how things turn out. Feel better.