CONSTANT CHEST PRESSURE, WHY?

I have chest pressure in the middle to left chest. I always have it and it varies through out the day. I been having this for the past 5 months. I been to the ER twice and EKG and Chest Xray were normal. After full meals it becomes worst and is almost as a squeezing pressure around the left side of my heart, I also get nasal congestion when my chest pressure worsens. I am 5'8 205 pounds, I eat fairly healthy, and I exercise fairly as well. Im a recoverin drug addict and I dont smoke or drink anymore. Exercise helps relive pressure only for a few minutes and Sleep also. I am losing my mind and am starting to think i have no hope, this effects my work and regular life. Please help. thank you. This pressure creates my anxiety.

Panic and anxiety disorders. I dont have insurance anymore.

I been diagnosed with Gastritis and Peptic Ulcer last year. I think GERD would be a cause. I dont feel any burning sensation in my chest. Howerver I did realize that when I wake up my pressure starts on my lower left rib cage and gradually works up into my Left chest.