URGENT!!!- PLEASE HELP?

i think might be developing a dependence on my depression medication. i was recently sent to the hospital cuz of a overdose and now im feeling the urge to overdose all day long. my mom hid the medication from me and ive been looking for it all day long cuz i can't fight the urge to overdose anymore. im 18 yrs old. what should i do? please help?!