Marie,
I know it better as Vasovagal Syncope - brought on by my ticker probs. and also as a response to extreme pain. My cardiologist dx'd it. I understand how your daughter feels about the G. product; I can't stomach it. Possibly, her cardiologist might have other suggestions - suitable to replace the G.
This describes how mine feels, and has felt:
http://www.healthboards.com/boards/s...3&postcount=23
When I was describing how it feels for me (at OBT Spinal Disorders forum), Tbackpain1 was very helpful; she actually informed me of the clincial name when others thought I was possibly describing migraines, which I don't have. She might also be able to help you

.
This is a link to her profile - in case you might want to PM her:
http://forums.braintalk2.org/member.php?u=269