I feel you, I studied abroad when the pound to dollar exchange rate was 2 to 1 and I literally had no money. I tried to feed myself as cheaply as I could for normal lunches and dinners to save money. Sandwiches and pasta with tuna salad. It's a special kind of hell when you can watch everyone around you spend money like it's free and you can't. Also take advantage of where you are living, I got to know my city better than anyone because I wasn't jetting off somewhere every weekend. And remember how lucky you are to have this opportunity, many people don't get to study abroad!