Cramps in Upper body. In upper body.

Dear sir; from last 1 year I am having trouble with the massive cramps in upper body. To explain in detail I would like to cut it in two points as: Point1: 6 months ago when I was seating on my working place I felt a massive cramp in my ribs and the same was literally travelled via right chest to the right shoulder. At some point of time I felt that am going to die. after 5 minutes the same was gone and I felt lil relaxed but a pain was their in chest and shoulder. Point 2: Nowadays; from last 1 month; I am facing another issue. many a times I feel cramps in my abdomen, chest, lower back and near my ribs. The same causes a flashing shooting pain which is unbearable. when I swallow food; I feel cramps coming in the various parts in upper body. I feel short of breath. Kindly advise me for further diagnosis. -Have smoking habit -some time consume alcohol too -age 27; weight 106 kg; height 6 ft 2"