It sounds to me like your mother has had a complicated medical course. When that happens it is important to look carefully at the records to see what really is going on. Frequently, there are things that happen that are not apparent. Drug-drug interactions are among those things to look carefully at. I mention that due to your mother's hallucinations. One of the big questions to be answered is "what permanent harm has come to her as a result of the misdeeds you describe?" This will need to be answered early on because investigating a case with a lot of medical records - such as when the patient is in rehab - can be very costly. You will most likely need to retain an attorney to see if something can be done legally. I encourage you to do that as soon as possible because there are time deadlines that apply to filing a lawsuit. You should also file a complaint with the hospital as well as the the Centers for Medicare and Medicaid Services at www.cms.gov
Good luck to you and your family.
Each states laws regarding medical negligence is different. Howevever, most lawyers will not take a case unless there is significant permanent injuries. See my website for a discussion of some of the considerations lawyers consider before they take on a medical malpractice case. See www.FloridaPersonalInjuryTrialLawyer.com. If you still feel you need to followup on your mother's matter, see a lawyer who handles these matters in your area.
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