Discomfort in upper middle stomach. Eating makes it worse, Kinda hurts to deeply inhale. Feels like fullness. Just gas?

Many possibilities. Epigastric pain could be caused by gastritis, gallbladder disease, ulcers, irritable bowel etc; You need to see your doctor for evaluation.
Various causes. Sense of fullness suggests the possibility that you may have a symptomatic hiatal hernia. But any true diagnosis must begin with a medical history and then your answers to specific focused questions, followed by a brief abdominal exam. If your symptoms are persistent see a physician. For more on hiatal hernia see: http://bit.ly/1CZ7ZSW For abdominal pain: http://bit.ly/10RdXop.