I am a very active fit person that has consistently exercised 6 days a week for the past 15+ years doing CrossFit style workouts and also a consistent runner (half marathon). My heart rate and blood pressure are always very low due to my active lifestyle. Normally my resting heart rate is in the 50's or low 60's and my blood pressure around 100-110/60-65. My health was great - I exercised, worked, was active with my kids, and never had any of these symptoms prior to the 1st dose of the Pfizer vaccine. Days 1-2 post vaccine, I only experienced sore arm, my throat became tight/raspier, and a little tired. A few days after 1st shot, I had a big heart palpitation that woke me from deep sleep and heart was racing/pounding in the middle of the night. Next couple days noticed heart was working really hard doing the simplest things like standing up, laundry, or walking up the stairs. Heart rate was faster, my blood pressure was higher at rest, and my left arm where I had the shot continually felt tingly/numb. On day 6, about 1-2 hours after working out while sitting at my computer working, I developed the most intense crushing chest pain, high BP, extreme fogginess/brain fog (couldn't see the words on the screen), nauseous, felt like I might vomit, light headed, my outer fingers in left hand couldn't function and type (they curled up), and thought I was going to pass out. I laid down and took a nap. Day 7, my overall body feels off with similar symptoms. Day 8, I tried working out again and ended up experiencing the same debilitating symptoms described above plus chills but worse which sent me to the ER. They ran a battery of tests (EKG, blood work, chest x-ray, abdominal ultrasound) to rule out a blood clot from vaccine or heart attack. All tests normal and sent home. Days 9-21 - overall body feels weak from head to toe, low energy, smallest movements make heart race/pound, chest feels achy (squeezing pressure at times), left arm is still tingly, brain fog is terrible, nausea off/on, appetite is off, losing weight, high BP for me (130-140/80-90's), dizziness, tighter/raspier throat, bra and pants feel like putting pressure on chest/stomach (so not wearing them), sitting can feel like compressing something so have to get up frequently, hard time focusing, and haven't exercised at all for 2 weeks. Exerting too much energy seems to make things worse. Aside from these regular symptoms, I keep having "episodes" where things get worse and feel like I may pass out.  I followed up with my doctor around day 12 and she ordered a 48 hr heart holter monitor and heart stress test. Day 22 (5/13) - another intense episode that sends me back to the ER (same symptoms described above plus a very painful lump feeling on left arm near where vaccine was given that developed couple days prior). Repeat blood work and chest x-ray. Day 23-31 (today), while my energy level has started improving and overall I don't feel as awful head to toe as before, I still have chest discomfort/heart racing with little exertion, higher BP than my normal, brain fog, sometimes feel like might pass out, left arm still tingly, and have noticed my feet turn bright red when I am standing (not even for a long time). Laying down seems to help relieve some of these symptoms. I have another follow up appointment with my doctor this week. There is no doubt, the vaccine triggered something in my body causing these symptoms. Now I just want to know how to treat it so I can get back to feeling 100% like myself before I had the shot.  I will NOT be getting the 2nd dose due to these extreme and alarming symptoms I have been experiencing for over a month now.