Yes, it's certainly possible to die from the complications of MC, and I'm sorry that you had to go through such a dangerous experience, but in Shirley's defense, I have to point out that I doubt that you would be able to find a GI doc who would rate MC as a life threatening disease. She was merely repeating part of the "official" medical description of MC. If you do a survey of the literature describing MC, you will see one theme that is repeated over and over. The words may vary, but the general theme is always the same, and it's generally some form of this, for example:
CONCLUSIONS: CC and LC share a similar clinical picture and have a benign course with . . .
Which is taken from this research article:
http://www.ncbi.nlm.nih.gov/pubmed/12591052
Dehydration is a very serious condition, and it can indeed be life threatening. With the secretory diarrhea that MC often causes, dehydration can occur surprisingly fast, and anyone with MC needs to be acutely aware of that risk, at all times. However, the same risk exists with any disease that causes diarrhea and/or vomiting - even simple traveler's diarrhea. The difference is that it can happen sooner, with MC. From a medical standpoint, however, the disease itself is not considered to be life threatening - it is considered to be a "nuisance" disease. That's not my opinion, (and I'm sure it's not Shirley's opinion) - it's the opinion of the medical community. Obviously, it's possible to die from complications of virtually any other disease that is normally considered to be benign, for that matter, if something causes the body chemistry to become dangerously out of balance.
I'm very sorry that your doctor took so long to provide you with a diagnosis. At the very least, he or she should have warned you of the dangers of dehydration. According to the medical community, dehydration is life threatening - MC is not.
That said, no one here would argue that if you did not have MC, you would not have been in that life threatening situation, so we certainly see your point, and we definitely sympathize with you. There are several other things that I disagree with, concerning the medical description of MC, but this post is already too long, so I won't get into that, just now.
Tex