You poor thing! I'm so sorry you are having to deal with this at such a young age. I was not much older than you the first time I experienced the pain and "embarrassment" of IBS symptoms. We do have a few members on here who are young and in school, trying to manage their symptoms and still lead a full life. It can be done!
I would first recommend the most important (and the hardest) thing to do: CALM DOWN. There is a direct connection between the amount of stress and emotional upset we experience and the intensity of symptoms. Anxiety and stress are not the causes of IBS but they DO exasperate the situation. Stop worrying about your parents. As a mama myself, I can assure you that worrying is a parent's JOB. And even if you pretend everything is fine to protect them from being concerned, a mama will always know when her child is not well. So just give that one up! Be grateful that your parents care about your condition. We have a few young members here who complain that their parents don't take their symptoms seriously and they come to the forums for support from us.
Embarrassment is always going to be part of IBS - unfortunately. When you are dealing with physical problems that involve the bowels, everyone feels uncomfortable. It's taken me almost 40 years to get over my fear of being "found out". Now, I just tell everyone that asks that I have a digestive disorder. Actually, you would be surprised how many people experience similar problems. They estimate that 20 percent of the population has IBS. That means that some of your classmates probably have it too. Everyone is different and some experience more pain than others. The symptoms change as well so what is bothering you right now may not cause problems five years from now. This condition FORCES us to really pay attention to what we eat, how we live, and how we interact in the world. In some respects, it makes us more aware than the average person who never has to think twice about how they treat their bodies. That is not such a bad thing, huh?
about the gluten free thing: it seems that if you've found something that worked for you in the past, you should stick with it. Hate to say this but doctors are not always the most educated about IBS. You will likely find more helpful and beneficial information from others with the disorder. You will also learn more from your own experiments, eliminating certain foods, relying on others. But remember that food is only one piece of the puzzle. Keeping your stress level to a minimum, getting regular exercise, learning to laugh about the bodily functions that cause so much embarrassment, and taking good care of yourself are just as important. Support from others with the condition is invaluable for me. That's why I spend so much time here!
Much of your treatment and routine will also depend on the type of IBS you have. If you lean toward Diarrhea, you may find this a bit easier to treat than if you lean toward constipation. There are many foods and over the counter medicines that can keep you from having "episodes" when you are in class. Constipation can be a bit trickier (and more painful) because you have to plan your day around BM's. When I get really "clogged", I will set aside two days of doing absolutely nothing while I purge my system with magnesium citrate, a strong and effective laxative.
I am curious about the medicine you were given. Acupuncture does seem to work for some people. If you are getting relief from it, that's awesome! Good luck to you!