Heart racing out of nowhere? 4-7-8 breathing ka koi asar hai ya bas timepass? 😭

Ok so idk if it's just me but my heart literally starts racing outta nowhere and I feel like I'm gonna die?? 😭 Today my mom started yelling about my grades and I had full blown panic attack on the spot. She said "bas natak kar rahi hai" and walked away lmaoo. Anyway I tried this 4-7-8 breathing thing I saw on insta - breathe in for 4 seconds, hold for 7, exhale for 8. Did it like 5 times and idk if it actually calmed me down or I just distracted myself but my hands stopped shaking a little. Has this actually worked for anyone here? Or do you have any other breathing hacks that don't feel too cringe? My overthinking brain keeps telling me I'm doing it wrong and it's making me more anxious lol pls help. Also if anyone else's parents don't get anxiety just say "same" 😭