Have they ever treated her for anxiety? I thought I was having a heart attack several years ago. They did a heart cath on me and there wasn't anything wrong with it. My doctor started to treat me for anxiety and the panic attacks stopped. I could handle the stress much better too. It's amazing how it helped clear my head. I was able to not dwell on bad things so much AND had had some pretty cool dreams. 

I'll be thinking and sending good wishes to you and your mom.