Hello I Feel As If Someone Is Sitting On My

Hello I feel as if someone is sitting on my chest every time I try to breathe I feel like I cant complete a full breath. I feel chest pressure and back shoulder blade pains when moving or breathing. I went to the er twice and my tests were fine. My ekg is abnormal.when compared with ekg of last year. Inverted t waves have replaced nonspecificTwave abnormalityin Inferior leads Nonspecifict wave abnormality is now evident in lateral leads.They daignosed me with a muscle spasm