Do you have a primary care physician? I think this going on for 2 weeks warrants talking to them about it. If it’s not changing, then the urgent/emergency need isn’t there. Getting to a specialist could be months or over a year though (took me 10 months for first-available appointment with a cardiologist who specializes in dysautonomia issues like I have; someone I met in the waiting room waited closer to a year and a half).

Alternatively, if you have insurance many of them have a nurses line you can call and get input. Like you mentioned you would do as an EMR, they’re likely going to recommend you go to the most extreme care (ER) because they don’t want to risk being wrong. But they might be able to talk you through your doubts. And hey, if it’s insurance they have motivation to get you to the cheapest care possible, so maybe they wouldn’t recommend ER after all, lol.

Lastly, since you’re stuck in decision paralysis, it might be worth taking some actions on your own to see if you can improve the situation. Obviously this isn’t the smartest option, but I know I’m stubborn, cheap, and have white coat anxieties after being dismissed for my health issues my entire childhood, so I tend to go this route often. (Heck, I waited until my mid-30s to seek care that ended me with a cardiologist despite having the symptoms literally as long as I can remember.) You mentioned potassium deficiency and my immediate thought when reading “palpitations” was electrolytes as well. If you have a history of high blood pressure ignore this, but if not, eating salt and getting magnesium/potassium can help a ton. My cardiologist insists I eat 7-10 grams of salt a day. It’s a fuckton, but hell if it doesn’t make me feel worlds better.