Coffee And ischemic heart disease!?

I am a CAD suspect my cardiology told me about two months ago. I just had 5 cups of coffee tonight, now i am feeling lightheaded and a bit short of breath and a little while ago i had to lay down on the bed because i kinda feel weird, felt like my heart rate sky rocketed and my heart was pounding very hard i can even hear it pounding. WHAT IS WRONG WITH ME! ANY DOCTORS OUT THERE?