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I am sorry to hear about this situation. Asking "how do I file a lawsuit" is a bit like asking "how do I do surgery on my leg myself." Meaning, we can spend hours or even days talking about every aspect - drafting the pleading, filing the pleading, civil procedure, expert requirements, evidentiary procedures, motion practice, pretrial, etc.
So, I guess what I mean is - what do you wish to know? Perhaps how to draft the petition to begin the lawsuit? Or, how medical malpractice is defined? Etc.
This is not an answer, but an information request. I need this information to answer your question. Please reply, so I can answer your question. Thank you in advance.