Yesterday I was outside pushing some snow, not very heavy, and I became short of breath. Went inside the house, attempted to back outside about an hour later. After putting my outwear on starting feeling short of breath again. After a few hours of resting I attempted again, this time with no issues. Today, no issues with breathing to speak of,but had terrible gas (belching for relief)/nausea all day. This has subsided. Now I am just tired. I did not eat today due to my stomach. I am away from home today traveling for business. Do you think those two episodes are potential signs of an incoming heart attack? Male, 44, 5'9", 175 lbs.