URGENT!!!- PLEASE HELP?

i think i 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 meds from me and ive been looking for them all day cuz i just can't fight the urge anymore. im 18 yrs old. what should i do about this? please help?!