Help! Anyone who's gone through a shoulder dystocia experience

Michelle • 27 years old Wifey & Momma of a 3 year old. Currently expecting #2 in July 2015
In pregnant with number 2. First son was born with Shoulder dystocia. Scariest thing ever!! Now my doc keeps talking about c section with this baby. That she thinks it will happen again. I don't want a c section.! I want a natural birth. But I'm feeling really unsupported and unsure of what I can do to avoid a should dystocia happening again and also avoiding a c section! So anyone who's gone through this I need ur advice.!