sudden onset tachycardia

hi everyone! i’m back with another cardiovascular concern.

i’m currently snowed in and freaking out just a bit. my average heart rate, both resting and active, has increased. not like dangerously high, but like right at 100 bpm or a couple beats under. i also feel out of breath very very quickly when needing to make any movement. i am overweight, my diet isn’t great, i have hypertension (on lisinopril for it), and i’ve seen a cardiologist for chest pains for a similar issue with palpitations and feeling out of breath back in 2023 (EKG and echo looked normal) but it’s been several days of this new increased heart rate. i heard plaquenil can cause something called long QT? is it possible to get it like…after several years of taking it? should i look into POTS?