Mandy, WIth what you have been through with school and your other activities you are constantly on the go. I have been in your position before. I'll try to address this one at a time.
First your heartburn could have something to with your daily eating habits. (Diets are fads). Make your change slowly this way you are not overwhelmed. Instead of fast food cook something or a Lean Cusine or Healthy Choice Dinner. If you must eat fast food leave off the fries and soda get a water instead. Eat on a regular schedule every 2 and 1/2 hours to 3 hours.
I am not sure what kind of living are you have instead of storing your T.V. keep it out of the bed room. Try listening to some Jazz or classical music at(Something that will relax you.
You have made a decision about school so let it rest. Move on to the next thing. the Purpose of a Driven Life is a very good and useful tool. I am also taking it that you haven't had a lot of working out. I know you are very active with the youth group (I think). Yes these are wonderful activities and I commend you for wanting to make a difference.
So my next question and the point is what does Mandy like to do? I see a soccer ball with your name? Do you like to camp, hike, fish, ride bikes, shop, read or somethhing else. Prehaps take a small day trip by your self or with a friend or family. You live in Kansas, right? How about a baseball game ( Not sure how close you are to one of the stadiums) Depending on the location you are not that far from Colorado. ( We could also make a million excuses not go somewhere). You owe it to your self to just relax. Sometimes we need a weekend to ourselves and if you miss a weekend of activities that you do that is okay. Take break.
Try a dark room and candle light and a warm bath with slow music. I listen to Keeny G when I want this mood. Have a nice long prayer when you get into bed and evrything that starts racing list them.
Hope this helps.
Vicki