Does my case merit filing a dental malpractice suit?

Approximately three years ago, I went to a dentist who not only was verbally abusive to me, but also caused injury to me as well. I have had continuous and increasing pain on the areas she did root canals on. I did not go back to her, because of her surreal mistreatment of me and was afraid to go to another dentist until this past week, when I found out that the reason I have had so much pain is that when she did the root canals, there were foreign bodies left behind below the jaw causing severe abscesses. I now have to go to a specialist, who will have to do extensive procedures to try to remove these foreign bodies, if it is even possible for him to get to them. If it isn't, I will have to have two (or more) teeth extracted to reach the area below the jawline, and then get dental implants. I have other health issues as well, including a heart condition and this severe infection compromises my health. I am on permanent medical disability, which is my only source of income. The verbal abuse was bad enough, getting severe infections that are very costly and due to her negligence, is another. I do not believe that I should be held responsible to pay for the damage caused by this dentist. Please advise how I should proceed, as soon as you possibly can. This is rather serious. Thank you so much for your time and assistance.