HELP!!! Cant sleep due to coughing all night!!?

I was told friday by the doctor the i have bronchitis. he put me on antibiotic, mucinex and a cough suppresent called benzonatate...well it isnt working, i havent been able to sleep for 3 days i end up crying all night because i just want to sleep, my stomach is sore i just want to stop coughing...i have tried sleeping sitting up, i am drinking lots of water...is there anything else i can do??