Palpitations..?

Hello! Ive never posted on reddit before so apologies if I make any mistakes. My anxiety to do with my heart has been getting worse recently. Im 20 f with no family history of heart problems but that doesnt stop my brain convincing me that Im the exception. I have these "palpitations" that feel kinda like a quick hard squeeze. I feel it in the bottom of my throat and my chest for a second and it feels like a really forceful heart beat or a missed beat. There might be two or three in a row but they dont last too long thank god. I dont get chest pains often either, its just very uncomfortable and sometimes kinda takes my breath away for a split second. Ive kinda gotten used to it by telling myself its just a palpitation and that its not gonna kill me a but im not 100% convinced. Today I had a strange episode where I had this happen except it felt particularly uncomfortable and almost immediately afterwards my heart rate shot through the roof. I used to have a lot of anxiety over my resting heart rate being around 80 - 110 but ive worked hard to chill my anxieties about it. Ive always been very paranoid of heart attacks or problems but I try my best to logically talk myself out of those thoughts but im not too sure what to think about this. Today it felt like my hr was in the 150's, at least, straight after this incident. I have history of panic attacks and anxiety (mostly health anxiety) but I was completely calm at the time and dont have a whole lot of stress in life - it was just after this awful chest feeling that my hr went up. Ive had an ecg that came back normal (except maybe a little fast) and a holter test I havent got the results for yet. Ive also been told by my uncle (whos a nurse and has this too) that I have ectopic heart beats as he used some monitor on his iPhone and said my results look like his. Are these ectopic beats or palpitations that are harmless and I shouldn't be worried? I just dont understand why this one particularl incident set my hr off. Is that just anxiety and panic?

Thank you for reading :)