Ed imdur

Hi! A few months ago I (32F) had a scary cardiac episode (two, actually) and I’m still trying to figure out what it was. But first, some basic info:
Age: 32 Sex: F Ethnicity: White Prior health conditions: Migraines with auras, ADHD Family history: My maternal grandfather had at least one heart attack and some sort of heart-related aneurysm, details unknown. My brother has a heart murmur, which I believe is caused by a “hole in the heart”, but again, details unknown. My mother has recently developed a heart murmur as well. Paternal history unknown. Medications (before PASC): Adderall IR 20 mg and 10 mg once a day each, no cardiac or BP side effects noted Medications (during incident): Same Adderall dosages, guanfacine 2 mg once a day, either sildenafil or Imdur (I can’t remember which I was on at the time) Lifestyle: Non-smoker, no drugs, occasional drinking (1-2 drinks when I do)
Background: So I got COVID for the first time in November of 2022. It was pretty brutal, but I wasn’t hospitalized or anything. I did develop PASC (Long COVID) however. It manifests mainly as endothelial dysfunction, though I did have other symptoms earlier on in my illness that have since resolved.
The primary symptom of my ED is angina with exertion. I’m currently taking sildenafil and metoprolol for it, which helps quite a bit! I’ve also had a significant (for me) increase in heart palpitations with the onset of my PASC. It was worse earlier on, but I still get them from time to time, mostly PVCs and during bouts of sinus tachycardia. I had a 30-day event monitor which showed random PVCs, at least one episode of bigeminy, and episodes of sinus tachycardia. I’ve also had multiple EKGs, an echo, stress echo, and an MRI stress test. Everything was normal except a pre-existing IRBBB and atrial septal aneurysm. I can post my EKGs if desired.
The incident: This happened in early October. I was riding my horse and decided to end our workout with some cross country jumping. We had already been working for around half an hour at that point. We went over a handful of jumps and then slowed down for a walk break. My HR was in the 170s, which isn’t unusual for me when doing high intensity workouts. I also often get random solo PVCs during recovery.
But this time I got hit with a salvo of PVCs that took my breath away. I pulled up my horse and took my pulse. What I felt was back to back PVCs for upwards of 15-20 beats at a time. Then it would revert back to sinus tachycardia for a few beats before another salvo would begin. This went on for about a minute I think, but I wasn’t actively timing it so I could be wrong. But there were several salvos before it stopped for good. My HR recovered normally after that.
We then did another round of jumping and it happened again. At this point I decided to try to make it stop using the Valsalva maneuver (I used to be a powerlifter, so I’m very familiar with it.) It didn’t work. It actually made it a bit worse, if anything.
Then I started to become symptomatic. I began experiencing my typical anginal chest pain which radiated to my left shoulder, nausea, shakiness, and wooziness. I dismounted and we slowly made our way back up to the barn. I don't remember when the salvos stopped that time, but I think it was similar to the first episode. We got to the barn and I began untacking my horse, but I was not feeling well at all. It took 10-15 minutes for me to start feeling normal again, though I had some residual fatigue for quite a while afterwards.
Question: So, what the hell did I experience that day? I'm almost certain that I was having back to back PVCs with a HR in the 150s-170s, which I think fits the definition of NSVT? I know SVT is a possibility too, but the palpitations in my pulse felt exactly like my PVCs do, so I'm not sure. I also realize that it's impossible to say without an EKG tracing from the event, but I stupidly forgot my HR monitor that day so I have no way of knowing. I also (thankfully!) haven't had any more episodes since then, assumably because of starting metoprolol soon after. But that means I also haven't been able to get an EKG of it. If it was likely NSVT, is that something to be concerned about? I mentioned it to a few of my doctors, but no one seemed worried about it. I just don't want to end up having a sustained VTach episode someday and go into VFib or something. Especially since I was recently reinfected with COVID and don't know yet if it caused further endothelial damage. But yeah, any thoughts on what I experienced and if I should try to bring it up with my doctors again would be greatly appreciated!