Oh ButterCup,
*Warm hugg* Don't feel embarrassed. Please. I know how hard it can be when you vomit and then pass out (I have seizures and pass outs). But, the people around you when it happens are concerned because they don't know how to help. When I would "pass out" I could hear everything going on around me. I would always think "goodness, I wish they would calm down out there!".
I am so sorry you have been diagnosed with chronic fatigue syndrome. In all reality you are worn out in only a few hours times. This diagnosis will help your other doctors to quickly know what your other symptoms are. This way you don't have to talk about how tired you are, how little you sleep, how little energy you have. Just say it in one word instead of 15-20min of explanation. Then you can spend time talking about the really important stuff like your pain, stomach, nausea....
You know, it took nearly 30 years for before a "team" of doctors put the pieces together to realize I have inherited Hypoparathyroidism. It wasn't until my "rate 0.0025" AND the "Hypoparathyroidism" began taking over my body that they "figured it out". I have had cataracts my whole life. It was something I knew about, but it had been that way my whole life and it never bothered me that I couldn't see. I have had seizures my whole life, but it never bothered me. I would just say "Oh I waited to long for lunch" or "Oh I got up to quickly". I had no idea that wasn't normal. My hands and feet would tingle all over my whole life and I seriously thought that was what people meant when they said "My foots asleep or my leg is asleep". I even keep two full book cases of collage text books so I can look up the things I forget. I had no idea that "I forgot" was different from "I have no memory". 
I know, silly hua? My point to all of this is.. Even if they do not find out today, or tomorrow we still have to keep praying and keep hoping that they will find out what is going on at some point. Don't be discouraged. Things will come to light eventually. You are doing a great job and giving each day all you have to give!
I don't want you to worry about only doing three hours of school. In all reality that 3 hours is more work on your body, than a "normal" persons full day of work on their body. Your doing your very best!
Has your parents thought about sending you to a pain psychologist? Someone you can talk to about the "medical stuff" that is happening in your life? If not, you might want to approach your parents about it. Even just a counselor. Sometimes it helps to be able to talk to someone about all the scary medical stuff. Might even want to find out if there is a young group for chronic patients at the community center or university hospital.
I hope by now you are resting up. And remember, don't worry about the little stuff. Just focus on you! Please, know you are in our hearts and prayers.
*warm hugg*
dani