You need to get back on a stable med regime as soon as possible. I think you should talk to a doctor about the missed doses as it will take a while for the meds to reach the right therapeutic level once you start taking them again. Once you're back on meds then you do need to make them a regular habit, forgetting the odd dose once in a while shouldn't normally be a problem but stopping and starting anti-depressants is the surest way I know to make them poop out.