Is There an Interaction Between Botox and Sleeping Pills?

I had botox for crow's feet last month. My doctor told me that there were no side effects in the area and that my smile wouldn't change. But now when I smile I have bags under my eyes and weird cheeks. I also experienced side effects indicating the toxin spread (losing my voice). I told my doctor I was on trazadone for sleep and he wasn't concerned. Afterwards, I noticed on the botoxcosmetic.com, that sleep medication causes complications. My questions are: Will trazadone cause the botox effects to last longer? Could I experience more adverse effects as time goes on?