Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
In order to hold the doctor liable for not properly treating you I am afraid you will have to get to another doctor to examine you and the doctor will have to review the first doctor's actions and determine that they were negligent in that they were below the reasonable standard of care for a doctor with her training and experience. This is the requirement for any type of malpractice case. Unless you have a doctor willing to sign a expert report stating the first doctor was negligent, then legally you would not be able to file suit against the first doctor simply for refusing to prescribe medications, since there is no law that mandates that any doctor prescribe medications. Even though your cardiologist said it was okay to prescribe the medications, you still need a doctor to sign an affidavit/expert report stating how the first doctor was negligent in failure to prescribe despite the approval from your cardiologist.
If you get this expert to agree that your doctor should have prescribed the medication and failure to do so was below the reasonable standard of care, then you would have grounds to sue for malpractice and seek your pain and suffering damages.
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This is NOT the practice of law nor is it legal advice to you, it is merely educational information for you to use to seek out a licensed attorney in your state to get actual legal advice from them. Please use sites such as http://www.martindale.com or http://www.lexmundi.com or http://www.hg.org to find a local attorney to get actual legal advice in all matters.