What Causes Muscle Spasms In Chest, Upper Stomach Pain And Shortness Of Breath?

I ve been having some problems and I am beginning to piece them together. I m always tired even when I first wake up. I cant even ride a bike far anymore. I tried to shoot hoops with my grandson and was tired after the first shot. Out of breath tired. Panting hard. I also have muscle spasms in my chest. Like vice grips. I have upper stomach pain. Not like cramps but dull, constant pain that goes to my upper back. I cant keep up when I walk with people. I like going to marti gras but I have to leave almost an hour ahead of people so I can be there when everyone else is there and they always end up leaving me because I cant keep up. I have gained a good bit of wait that I have never gained before. And Im causious about how much I eat and still cant loose the weight. I m 5ft and 70lbs. I m 55 and very active or I use to be and also I keep heart burn. Cant seem to get rid of it. Am I crazy or what. My Dad had 3 light strokes and died of a massive heart attack. His brother also died of a massive heart attack. I do have high blood pressure and am taking 3 different blood pressure pills. I m an over the road truck driver. Please tell me what you think, please. Oh, I had cancer. Oral on my tongue. 7 yrs cancer free.