yesterday I was playing Halo 3 after I ate dinner, I was getting a bit aggravated and then I suddenly felt lightheaded, I felt a bit flushed, and the area around my diaphgram felt like it had a bit more pressure. I felt no pains in my shoulders or extremities, I did kinda feel like my heart beat was a bit faster. Had no difficulties breathing but shifting around different positions altered the way I felt. I ve never felt hearburn before so I m not sure if this is it. Does this seem liek heartburn, angina, or something else that I might be overlooking?