Her experience "triggered a desperate search for information," but she was surprised to find no body of research compiled on the disease.
Determined to help other women and children avoid her experience, McCall researched and wrote the "first and currently only comprehensive guide" to the illness for patients and family members, "Beyond Morning Sickness: Battling Hyperemesis Gravidarum."
"If I had possessed such information in my first pregnancy it would not have ended the way it did," she said.
Aside from the physical anguish women can experience with this illness, there is also a "negative and crippling social aspect" that is "often ignored."
"Not only was I sick with the most bewildering and horrible illness I had ever had in my life, I was also victimized by unfounded prejudice, and on occasion harmful comments," she said.
McCall has authored a children's book, "Mama Has Hyperemesis Gravidarum (But Only For A While)." Another book, "The Chronicles of Nausea," is currently in the works and will be released in Jan. 2013. All proceeds of her books go to helping others suffering from the illness.
Thanks to her personal research and the publication of her book, McCall has been able to connect with other women who have battled similar cases as hers.
"The feedback I received was phenomenal, and I have the priceless gift of having been in the delivery room watching children who were scheduled to be aborted be born instead," she said.
McCall said she hopes that good may come out of Kate Middleton's illness as well, by raising awareness about Hyperemesis Gravidarum.
"For a person of her visibility to point others to her own personal story and to helpful resources would save countless lives."
Had she known about the proper treatment for the illness, McCall and her first child could have been spared the tragedy of an abortion.
(Story continues below)
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"If people could get the care they needed," she said, "more mothers and children would be spared the pain of exacerbated suffering and unwanted abortion," she said.
While every pregnancy is different, McCall said, women who have experienced the illness on one occasion seem to be more susceptible for it reappearing.
"This could be bad news for Kate Middleton," McCall said. "Hopefully, she will be one of the lucky ones and have normal future pregnancies."
For more information about Hyperemesis Gravidarum, please visit beyondmorningsickness.com and helpher.org.