Sorry, this is long, but please read it if you can!

Details:

• Location: Ontario, Canada.
• Height: 6'0".
• Weight: about 200 lbs.
• Race: North Indian.
• Existing medical issues: ADHD, autism spectrum disorder, generalized anxiety disorder. Gallstones that have yet to be removed (operation keeps getting postponed due to COVID), but they haven't hurt me in months. I had high blood pressure problems in my teens but I get it regularly checked and doctors have never seen fit to prescribe anything.
• Current medication: Concerta (methylphenidate), 72mg, daily. Have been taking this dose for over a year with no prior problems.
• Substances: I occasionally (about twice a month) consume cannabis, usually in edible form, sometimes smoking; I drink about 1 unit maximum, around once or twice a week. I haven't consumed anything since these episodes started.
• Any other relevant information: I have received both doses of the Pfizer COVID-19 vaccine, the second one in mid-June.

Primary complaint:

About 4 days ago, I started having mild chest pains, heart palpitations, and brief spells of dizziness and nausea. Eventually I started becoming a little short of breath as well. All of these symptoms started in episodes of 1-2 hours, and once they went on for 6 hours. Eventually, as of today, the heart palpitations and shortness of breath became basically constant. I can more or less always feel/hear my heart beating pretty strongly right now, which is very unusual for me. So the chest pains and dizziness/nausea still come and go in episodes, but the palpitations and shortness of breath are constant by this point. Even sitting in my chair writing this I can feel my heart beating loudly and fast.

The chest pain feels a little like a vice clamping down on my chest, from my mid-sternum to my clavicle, equally prominent on both sides, but it has never been severe. I would not describe it as anything more than a 3-4 out of 10, even at its worst. Most of the time it's been maybe a 1-2 out of 10. It's similar to the "tightness" feeling I get during anxiety attacks, but constant, even when I'm calm/lying in bed. Similarly, the shortness of breath is never enough to cause me to gasp for breath, I just feel a little out of breath constantly, as if I'd just exercised a lot. It's also about a 3-4 on 10 at most, but it's slowly getting worse. There is seemingly no cough or cold accompanying the shortness of breath. It feels very much like a lump in my throat/upper chest.

All of this seems to be worse when I am in my apartment (which I need to stay inside since I work remotely). It's a studio basement apartment, if that is relevant. I have had one or two problems with dust and mold, but nothing in the past 3 months. Even if I go outside for a walk, once I'm inside, it comes back quite quickly. I don't know if it's tied to being inside or outside specifically, though.

I went to the ER today and they did an ECG, chest x-rays, and blood work. They found nothing and told me everything seemed okay. The only red flag seemed to be my blood pressure, which was a little high (I think it was around 140/90), but they didn't prescribe or say anything. I was feeling a little better when I went to the hospital -- the heart palpitations had calmed down for the first time in a few days, and the chest pain had lessened. However, once I got back home (as I'm typing this), it's immediately gotten worse again -- the palpitations, mild chest pains, and shortness of breath are all back.

I'm really worried, especially as there's a big history of heart disease in my family -- my uncle (64) passed away from a heart attack this January, and he was not close to the first person to have a heart attack under 70. Please let me know if there's anything I can do, or if you suspect anything.