I've had most of those symptoms, but it seems like I've had these sypmtoms for a long time. I've gone to my dr and they've said I had low calcium, but that was yrs ago. How serious is anemia?

If you're worried about it, go to your dr. and get your blood tested. Ask them to test thyroid too, but they usually do anyways. Anemia can put you at risk for other conditions, but I think that it can usually be easily taken care of, so I wouldn't worry. My anemia isn't that severe, so my doctor just had me take iron pills everyday for a couple years.