Hi) I may ask a stupid question, but still... My heart is beating rea…

Hi) I may ask a stupid question, but still... My heart is beating really fast, not like usual, my chest is shaking, although I'm not nervous, no physical exertion, I don't even know what to do ??‍♀️ Maybe tachycardia? Or drink some valerian root tea? What should I do? It's just not pleasant when you lie down calmly and your whole body shakes, even breathing gets interrupted?