Splenomegaly

I had to make an appointment for Christopher with an oncologist/hematologist for next Wed. He has an enlarged spleen (splenomegaly). The pediatrician noticed it on a regular checkup, I had to bring Christopher back in for a re-check where the doctor and one of his associates both felt Christopher's abdomen. I then had to bring him in for an ultrasound. He couldn't eat beforehand, it took forever and then he puked a couple of times during his nap -- either because of the stress or because he didn't get to eat breakfast but, rather, snacked on stuff on the way home from Loyola in Maywood. The day after the ultrasound, I had to take him in for blood work where they totally screwed up the first time, put him in pain and then did the other arm. He had another re-check today and now I have to bring him to see the oncologist/hematologist. I was already mildly freaking out and then I found this on the Mayo Clinic's website:

Enlarged spleen (splenomegaly)
Causes
Enlarged spleen causes vary, including:
Viral infections, such as mononucleosis
Bacterial infections, such as syphilis or an infection of the heart's inner lining (endocarditis)
Parasitic infections, such as malaria
Cirrhosis and other diseases affecting the liver
Various types of hemolytic anemia — a condition characterized by premature destruction of red blood cells
Blood cancers, such as leukemia and Hodgkin's disease
Metabolic disorders, such as Gaucher's disease and Niemann-Pick disease
Sometimes pressure on the veins from the spleen or to the liver cause an enlarged spleen. A blood clot in a vein from the spleen or to the liver can have the same effect.