Diagnosis mystery

[irrelevance]

Hi, I'm Kelsey.  I am posting my question to a few different forums which pertain to possible diagnoses, and listing the symptoms that my grandmother has been experiencing.  We  have gotten several 'guesses' and two official 'diagnoses',  but I am not happy with them so far.  And all I ask is for you kind folks who may know this particular affliction that this forum deals with, and tell me if you think it fits at all.

My grandma is 62, and it has been twice now, about one week apart, that she has an episode where she experiences some rather severe chest pain, tightness, and pressure and tingly weak arms, and blacking of edges of vision.  She goes unconscious while still sitting up, her eyes go up in her head, her muscles stiffen, her jaw drops down, and she vomits in spurts,and at the time that the EMT got there (so not during the attack)  her pressure was 111/64, and she had some arrhythmia.
She has a long standing history of frequent vomiting, almost like when a baby spits up with little external reasons.

notably, she also has low blood pressure, and high cholesterol.

Medications:
she was prescribed a regime of low dose bayer aspirin, fish oil, and Zocor.  From my understanding, she was additionally taking Zantac or something similar, 3 a day instead of the recommended 1 a day to help control the frequent vomiting.



The first diagnosis for her was costochondritis, which is inflammation of the cartilage attaching the breast bone to the ribs.  Most commonly caused by over exertion  (she does no heavy lifting or anything like that)  I thought this diagnosis was bogus, and does not even begin to cover other problems she is having aside of her chest pain.
The second was "probable panic attacks".  Thus, why I am here seeking other opinions.
  I am just looking all over for any help i can find.
Personally, I suspect her heart and stomach have other roles in this, but has anyone here heard of such a thing as I've described?

Thanks for any input.

[mammo]

Like you, I'm not buying the panic attacks as her problem. I would request they do an EEG to rule out Epilepsy.  

[irrelevance]

I didn't either.. I came here because of the "panic attacks" they pinned onto the whole ordeal.  She has just been to the hospital, I do not think she has seen any specialists yet.  She had an MRI I believe, an x-ray, some blood tests, and a stress test.  Other stuff is going on with me, so i have not been able to follow up with her on her paper work and stuff from this most recent visit to the hospital, when she got out yesterday.
Anyway, all of the above mentioned have come back normal.

[mammo]

Has she seen a Neurolgist or Cardiologist regarding this?  I was thinking Epilepsy, but have never heard of vomiting being part of that.  It would help to know what type of doctors she has seen and what tests have been done.  I don't feel this has anything to do with anxiety.