HELP!!!

Anyone have any suggestions for a really bad cough? I am taking Cepacol Ultra, Dayquil, spraying my throat with Chloraseptic, and sucking on cough drops like it's my job. Nothing is working! My back hurts from coughing so much. I feel like little blood vessels are bursting in my brain. There's just this tickle that won't go away. Any suggestions will be greatly appreciated!

Also, can you OD from cough drops? Um, I hope not.