Like your doctor previously said, The scar tissue could rapture which is problematic for obvious reasons. That being said, enough time could have passed that you are more likely to successfully make it through a vaginal birth. Your best bet is to talk to a few OBs. No one on here knows your medical history and can give you an accurate answer, just a good guess. You may be hard pressed to find a doctor who is willing to take a risk like vaginal birth but the more you talk to, the more information you have to choose if vaginal is really what you want to do.Ask for the risks, and benefits and make it clear that you feel very strongly about giving birth vaginally. The doctors face a lot of liabilities in the event of an accident, so they have the right to tell you they won't preform a vaginal birth with you. Just make sure you understand the risks of what you are asking for, and the benefits out weigh the risks. Depending on your medical history you should be able to find a doctor that will allow you try it, you might have to work a little harder to find one.