I received the Maderna vaccine in March. For months I was getting more and more fatigued. Sleeping all day after sleeping all night. Finally I couldn't walk 100 ft without resting. So three weeks ago I went to my physician and got a blood test. That night I was instructed to go straight to the emergency room and get a blood transfusion. I had been diagnosed with critical anemia. Whether this is tied to the vaccine or not, cannot be proven.