I need help my hearts been hurting n I get terrible headach n get light headed when I get up from, lyin down?

Ok my heart races n pound often and its irregular sometimes it feels like it skips a beat and it hurts. And after I get up from lyin down my hearts slams fot a couple of seconds n I kinda black out n get very lightheaded, this has been goin on for years and happens all throughout the day I gets worse if I eat really greasy foods or salt plz help