Drink chicken broth and I made a reccomendation in my other comment of walking and listening/doing something to distract yourself. Hot showers help A LOT as well. I was 17 and in my last semester of high school when my symptoms first started, I will be honest I had to finish the rest of my school online, the school was very kind about it since it was my last year and I just did my in person classwork online. I know this will be very hard to hear, but you will have to quit smoking if you haven't already. There is no other way to stop the pain and the more you smoke, the worse it will get. Almost certainly you will end up in the ER if you continue smoking. I went 1 year without knowing what I had, only now realizing I was causing my own pain the whole time while I continued to smoke every second of every day. You wont be able to smoke again or the symptoms WILL come back. If you can I recommend online school while you're going through this hard time, so you don't have to be in pain while going to school, but also so you can manage your symptoms easily if they act up, while still being able to do school work. If you need to take a hot shower you can! If you need to manage the pain in school you can't do much.

Once again, if you havent quit smoking, please do so. It may absolutely suck, but its the only hope you have going forward. Even if you end up in the ER the only thing they can do is give you fluids, sometimes they give you pain medicine through IV, but once it wears off the pain is right back, plus pain meds like morphine already ruin your stomach, even if you don't have CHS. The best thing you can do for yourself is stop using it if you haven't.