Hello, I see that you have just joined Mayo Connect. Have you had the opportunity yet to look at any of the other posts or information here about Post-Covid? Like: https://connect.mayoclinic.org/blog/post-covid-recovery/ – the newsfeed covering all the latest information and research regarding long-lasting Covid issues.
Since you know your hemoglobin is low, has you care provider suggested any treatment to help? The fatigue, breathing and dizziness can all be lingering Covid aftereffects, but can also be caused by anemia.
Maybe someone else with this symptom will let you know what has helped them.