I had the J&J vaccine in March 2021. I’m an avid runner, healthy early 40s female. I felt unwell very quickly after the vaccine (did not have Covid at the time). I had terrible abdominal pain on and off and felt weak. During summer 2021 I started having tingling/numbness in extremities, abnormally higher heart rate when exercising. I thought I was going to pass out after an easy run. Had blood work in Sept 2021 and it came back I had a high platelet count in high 500s (now hovers in 600-700s). Referred to hematologist/oncologist and went through monitoring/testing over several months. Had NGS and bone marrow biopsy confirming ET CALR Type 2. I asked if it could be attributed to the J&J vaccine and I received a shrug. Like it doesn’t matter because I have this disorder and it needs to be monitored going forward. I haven’t lived anywhere where extreme environmental factors could somehow trigger this mutation. I haven’t had any illnesses except for the occasional flu or sinus infection. I’ve had 2 babies. I have a desk job and live in the suburbs. It’s just weird there is no explanation. I opened a case with VAERS and have not heard anything.