Need help, doctors cant find anything wrong?!

My mum has been having these symptoms for the past few years: Hot and cold sweats, nausea and then dizziness and on occassion, she will pass out!. This is causing her stress as she is becoming more home bound as she is scared of this happening while driving!. She has seen the doctor and they have put her through numerous blood tests, cat scans and other tests, but nothing is ever found!. Does anyone have any advise as to what could be causing this or even a suggestion on some tests that may be of use!.Www@Answer-Health@Com

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