Well, Sir Thomas, we may never really know exactly what made you have to be hospitalized. The doctors suspect that you had a virus at the same time you had a bad ear infection which caused you to not be able to walk. They were worried that your ear infection jumped the bridge into your brain, so that is why you had to go through all those tests. The blood doctor was going to draw more blood from you yesterday to check viruses, but your little brother saved the day by getting sick himself! Since you are getting better, he said you don't have to come in. If you get bad again, we'll have to go, so keep praying, kiddo!
Incidentally, this is what your brudder looks like when he's sick. Of course, he's with his cousin Mary, so who wouldn't be happy! More on your health below...

One of the big concerns while you were in the hospital was the low number of neutrophils in your white blood cells. You were very neutropenic. There are several causes of neutropenia, but they believe yours was caused by a viral infection.
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FROM WIKIPEDIA:
There are three general guidelines used to classify the severity of neutropenia based on the absolute neutrophil count (ANC) measured in cells per microliter of blood:[1]
Mild neutropenia (1000 <= ANC < 1500) — minimal risk of infection
Moderate neutropenia (500 <= ANC < 1000) — moderate risk of infection
Severe neutropenia (ANC < 500) — severe risk of infection.
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When you arrived at the hospital on the 12th, your neutrophils were 184.
On the 14th -- 540
On the 15th -- <500
They let you out because they could see that they were on the rise.
When you got another fever on Friday the 17th, your neutrophils were 2200. This is why you did not have to go live in that room again and wear that yellow robe. And this is why we're becoming less worried.
There were (are) so many people prayed for you that I believe it is safe to say that "All Thanks Be to God" is in order. He is the greatest healer and He gave all those wonderful doctors, nurses, technicians we met every ounce of their talent. Yes, sir, and then He put them right in your path. And so that is why you hear your mother saying, "Alleluiah! Alleluiah!"