My mom thinks i do drugs: help?

let me start by saying that i dont do drugs. i tried them once and never did them again. my mom found my friend's bottle of visine (eyedrops to reduce red eyes) in my bag because i was holding them and never gave them back. we had a fight and she hit me and i hit her. i then called her when she left and she seemed apolagetic but doubtful. what can i say or do to make things right? please help im really depressed