What Causes Upper Back Pain And Heart Palpitations At Night?

I kept having upper back pain at night with a rapid heatbeat. I went to ER on one occasion and had an EKG and Ex ray done and blood work to check for clots but all test were negative. There are muscle twitching from time to time. It usually happens at night and worsen when lying down. Sometimes when I swallow my saliva it doesn t feel like it s going all the down but when I eat it goes down. For relief, I take 2 low does aspirin and my 25 MG of blood pressure pill, set up for a couple of hours.