soemthing is defiantly wrong with my heart

im young im 23. i feel like i have heart disease. idk where it came from. i have been feeling nauseous at night . then my heart beats fast. then it slows down and heart palpatations (sometimes when i’m dehydrated) then it gets into an adrenaline feeling.. idk im scared im going to have a heart attack ..it just barely started happening like a week ago or 2. maybe cuz of stress ? idk or me lack of sleeping. i seriously think i need a new heart or something .. i have anxeity and i know for a fact it’s not causing it. it only happens at night though. idk im so scared right now i have a nervous heart or something . im taking magnesium but i feel like it’s getting worse when i take it .. i been sleeping late til like 5am or 6am -1pm or 2pm.. Ima see a doctor tomorrow to see what’s wrong with my heart i’m terrified that they find something wrong with it ., 😞pleas pray for me please im scared and crying right now idk what it is . it’s making me not wanna eat and nausea. it’s weird cuz when i actually do throw up i feel a lot better .. but i don’t wanna throw up