Discussions that mention xanax

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For the last week I have had back spasms and difficulty breathing. I feel like I cannot catch my breath and get chest pains from trying to do so. Though this is usually intermittent, I have been having severe pains/difficulty all day long. I have also been extremely tired and have fainted twice.
I saw a doctor for the breathing difficulty a few months ago. She said it was anxiety and prescribed Xanax. The Xanax did not help my problems, even when she suggested that I double the dosage.
Last week I had a lung function test and everything was fine. I also had blood tests and chest x-rays which all came back normal. My dr. has scheduled me to have an echo on Wednesday.
A family friend said that when she was my age (20's) she had similar symptoms and it was her gallbladder.
Does anyone have any suggestions?