AB blood type and eating

Since the last post on AB blood type I have done some research and found out that there are diets based on your blood type.  I changed my diet according to my blood type and it has been helping.  I do not get sick every time I eat and the pains, bloating, and diarrhea have reduced.  This diet is still new to me so we will see if it continues to work. 
After reading about the diet, it makes sense to me and explains a lot of things.  However I wonder why the doctors don't tell you about this before they put you through all kinds of testing to tell you everything is normal.

I have undergone so many test since May 2010 and they have all come back to be normal, which in turn made me feel like they either did not believe me or that it was all in my head.  That is why I continued to do some research and found the diets per blood type.
For those of you that might be interested in checking this out, here is the website for you. Good luck
http://www.drlam.com/blood_type_diet/

Blood Type AB Negative

Blood Type AB Negative is very rare. Less than 1 percent of the population in the United States have AB Blood Type.     I have AB Negative Blood and I was wondering if anyone knows whether or not having AB Blood can have an effect on your health issues.  I get sick a lot and the doctors have done all kinds of test. The doctors  say everything comes back negative but I am still sick often. Since November I have had Chronic Diarrhea, very queasey stomache, and I am always running a low grade fever. I have done research on this and know the basics but have not been able to find anything regarding health issues.  Feel free to leave a commit if you wish.