I Took Some Melotonin Valariun And Benadryl 3 Nights In

I took some melotonin valariun and benadryl 3 nights in a row to help me sleep. Mid day I was so tired and thought the St. John's Wort in my cupboard would help wake me up. But now I feel extremely depressed and an overral sick. My brain is so sad and confused. I have never ever felt depression before but this is awful. So emotionally sick and completely weakness. It is beyond words to describe how extreme feeling is. Never felt anything like this before.
Could I have accidently poisoned myself by these supplements?