The same thing happened to me but with the Moderna vaccine. I am a healthy, half-marathon runner. The day after the first dose, I could not walk a mile. The second dose made me really sick, stuck on the couch for 4 days. I hadn’t been running much due to time restrictions so the anemia was not due to running. I signed up for a marathon and started practicing but my legs felt so heavy and I could not breath. I was having trouble sleeping, heart palpitations, tired throughout the day, and could not do all the activities I used to in a day. It also made me foggy-headed at times. I noticed my lymph nodes were swollen as well, and still are to this day, 7 months after my first dose. I’m August, I started going to my see my doctor and have had multiple blood tests, which confirmed iron deficiency and also high immunoglobulin M. I had an endoscopy/colonoscopy to rule out internal bleeding. I had an ultrasound on my lymph nodes and am now doing a CT on them. My ferritin is still low, my red blood cells are too wide now, and my TIBC is too high, and my IGM still too high as well. I have my energy back but still have a hard time with my breath running less than a mile. When I tell people it happened right after the vax, they always want to try to find another explanation, even my docs who try to point to birth control when I’ve been on bc for 20 years so that answer makes no sense. This needs to be looked into and taken seriously, there is something here….