bulimia help! scared!?!?

Ok, so i'm underweight, and this isnt about anything weight-wise, i just have a really stressful life, so I take it out on the toilet. I go every day, and stuff a tissue in the back of my throat until i gag several times, and then my food comes out. I really dont care how I end up... dead.. idgaf.. but like i dont want my teeth to rot, thats like really gross. So how do i do it without the enamel stuff side effects?