Lose the weight. Get out into the sunlight for vitamin D and increase your spirits, walk at least a mile each day preferably two miles, start your exercise routine and keep to it. You need cardiovascular exercise to get your body moving. Then start with exercises you can do in your apartment such as pushups and exercises with your legs like lunges and squats without the weight. Start with 10 pushups a day and work yourself up to three sets of 25. Start with 10 lunges for each leg (20 total) and work your way up to 80 total. Start with 10 weightless squats and work your way up to 40 in one set. This will be over time and will get your body moving. Keep up with the soccer but you need to be able to move your body more.
Then eat better, lose the junk and sugary food. Rely on the basics like oatmeal, bananas, milk, fruit, boston lettuce or romaine lettuce, tomatoes, cucumbers, carrots. These foods are really cheap at market. Also, get your meats from a deli, lunchmeat, cheese, and prepared foods like meatloaf or chicken, and pork cutlets.
Then apply to more grad schools in other areas such as south dakota like a previous poster mentioned. That change in your living environment will be an enjoyable experience.
There are some places in this country where only the best are able to survive; usually the metro cities and most of California. People who are not able to keep up often either die or move out to an easier area to live. Those unable to keep up are basically filtered out of society. Just because you were raised in a competitive area does not mean you have what it takes to live there. You need to pull yourself together. Your health, attitude, and work or school are the places to start.
The cubbyhole for your computer reduces airflow, thereby allowing the computer to overheat and shutdown. Pull it out of the cubbyhole or possibly cut a hole in the back and leave the front open to allow increased airflow. A computer that is not booting off a CD does not point to a hard drive problem. Your computer will run just fine with the hard drive disconnected and a bootable CD to boot from.
Going from economics to statistics? That can work well. Finance would also be good.