Chest pain radiates to left arm. Eating.

I am having pain in my chest, left arm and shoulder blade for more than 6 months. I had my ECG done twice but it was normal. I had some history of depression and took medicine for 1.5 years. Doctors said that it's because of that. I also had panic attacks thrice in last 6 months. I am having chills all over my body at random times. About 3 days ago, I was doing some physical work, I started having sharp pain in my chest which radiates to my left arm. It was also very hot outside that day(42°c). Doctors told not to worry but I'm still concerned about random pain in my chest. I can also feel dull pain in my spine and disc area and I also have some symptoms of cervical. I also feel suffocated sometimes. Sometimes my back of head and shoulders feel heavy. My physique is also not that good. Also my left arm gets heavy and chest pain after eating.