I am no longer anemic but still have low ferritin.
I remember back last year when I was "mildly" anemic (I was at about 11.6) and if I went shopping or did something "fun" on a Saturday, you can't bet I couldn't leave the house on Sunday. I was just WORN out.
Now, you are very anemic. That you can even get anything done is a miracle!

Yes, it would be totally normal to feel sapped after a day of running errands.
I think at this point, you need to consider yourself on iron supplementation indefinitely until you can get the bleeding thing worked out.