Addiction please help ***

Hello I am a girl struggling with addiction. I recently snorted a huge line of meth and I am still feeling the effects more than three days later going on day four.My heart has been beating rapidly, it’s been slowing down as the days go on but I still feel the effects. I feel as if I’m coming down but it won’t go away. Will this feeling ever go away?? Please help I don’t know what to do