Feeling Pressure In The Back And Chest, Nausea And Indigestion. Stress Test Advised. What To Do?

Hello,I have been having very bad pressure pain in my back and chest area..I think sometimes it may be Gas pain and I have been having severe indigestion and even water makes me nauseous.I have had dizziness for a long time and nothing I do cures it.I can't walk a very short distance without getting to tired to the point I have to lay down for a few minutes.Sometimes the pain I have starts in my back, radiating to my chest and both hurt at the same time,and then it goes to my neck and up and under my chin and sometimes to my ear..even my ear hurts at times.I have been told that I may possibly be having a heartattack but I don't want to go to the Hospital in fear of feeling dumb when they tell me it's just Gas. I also have heart disease in my family and have been told that I am prone to heartattacks because my mother had a massive heartattack in 04.I went to my doctor and he ran tests and everything turned out ok,but he put me on prilosec and it has helped the nauseous feeling a great deal..I still have some pain and he said If I don't feel any better within a month I needed to go for a stress test..Can you please tell me what you think I should do?