I Have Been Feeling, Weak, Tired, Anxious, Sick And Dizzy

I have been feeling, weak, tired, anxious, sick and dizzy (like I might faint but haven't)at different times but consistant.
I recently was diagonosed as having an ectopic pregnancy and it was a scary time but I miscarraded naturally after a scary 2 weeks. This was in the middle of July and I've just had my first period since but feel awful and scared as to why I feel like this