First of all, you and your family are in my thoughts and prayers. As far as this illness, I searched on "Google" and "Webmd.com" to get some information. From what I could understand throught the medical jargon, this is very serious and on a cellular level. One of the advice responses used the same "plain English" definitions I was going to use, so I won't waste your time. I'm sorry that my best advice follows, but I know if it were my child, I would puruse it the following way:
Make the doctor(s) write down what they suspect it is, explain it in plain English until you understand, and make suggestions on the best course(s) of action, specialists, etc. Demand that your doctor(s) give you a place to begin your research. If they need time to get a place, give them some time, but stay on them for the information. In the meantime, begin searching the internet for any and all information you can find that MAY be relevant to your child's condition. You will begin to understand medical jargon in time, but until such time, print out two copies of the article(s) and information. Take your information to the doctor(s) and give them a copy. If they don't have time to read it and explain it in plain English right then, ask them when they can give you the explanation as you will be continuing to search and need to know which direction(s) to continue in. If the doctor(s) are not appreciative of your efforts, research a new doctor or team of doctors. Let these medical professionals know that you will be part of the team helping your child, so they had best be prepared to help you in your quest. Most importantly, you are your child's best hope. There are health care professional out there who will work together with parents for the best interest of the child. Unfortunately, it can take something close to a miracle to find them, and in a case like this, it is vital.
Most of all, remember to seek support for yourself. We all tend to give everything we've got to our kids and forget to take care of ourselves, mentally, emotionally, AND physically. If you have nothing left to give, who's going to be there for your child? The best advice I ever received was: "In the event of an emergency, put your oxygen mask on before helping your child." When asked why, the flight attendant responded, "If you pass out due to lack of oxygen, you can't very well put your child's mask on at all. Can you?" It's hard BUT required.
Good luck to you and yours. If you need someone to just listen, you know where to find me. I am more than happy to help in anyway I can.
Hugs!
T.