I also think it might have been the Trazadone. I've had very similar reactions to it. Once I took 100 mg. of Trazadone and I truly felt like I had overdosed. I felt like I was on the verge of passing out, felt completely weak and sick, and had lights flashing when I closed my eyes. The whole thing was really scary. I threw the Trazadone out and won't ever take that stuff again.