The question of whether you have a case is for a lawyer to determine. Someone who you visit and lay your cards on the table with.
Get a referral from the local bar association or a friend if you know someone who had a similar situation and was satisfied with their representation. You are looking for an attorney who specializes in medical malpractice. Yes, it is worth it to go.
Laws differ from state to state and country to country, and they can change over time. Even if you were to miraculously hit upon a lawyer in here (there are a few) who (1) brings plaintiffs' malpractice cases on a regular basis and (2) practices in your state, that person is still not necessarily up on the relevant case law. This is for your own protection
- go to a lawyer and get a consultation (usually the initial ones are free), take any documentation you've got with you, and ask.