Hmm - these seem to be more medical questions than psychological ones. Yes, anxiety can raise BP, can make some people feel faint, nauseous, trembly, shaky, can even cause chest pains. As well, there are always the secondary complications - feeling embarrassed, ashamed, even fearful. So there are physical symptoms that can be generated by anxiety. I recommend seeking the help of two professionals - your primary care physician (in case these are purely medical/physical issues) and a psychologist (who can deal with the anxiety, if this is the cause of the medical problems).
Keep careful records; encourage your daughter to share and record her symptoms; take these notes to your professional.
Thanks for your question.
Dr Jeff
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