What is wrong with me?

I've had increasing scary symptoms within the last 3 or 4 months. I haven't had insurance so a dr was out of the question and the symptoms seem to keep growing. In early may I started feeling heaviness and pain in my right leg. It occurred often and daily, I got scared and thought it was my birth control and got off it. But then the pain became widespread. It would jump from one leg to the other and then my sides and my neck, shoulders...etc. The pain wasn't daily, but it came and went more often than not. And more recently I have had terrible chest and lung pains, almost daily, chronic headaches and fatigue. It is hard to breathe and sometimes my lungs just catch for a second and I can't breathe at all. Note: I am overweight and have been diagnosed -3 years prior- for having prediabetes. I recently did start a new diet and excercise regimen. I feel like it should be helping but my symptoms continue to grow and get worse. Any ideas?