Hi, Welcome to Health care magic forum.
It appears that due to the levels of the harmons in the blood are maintained bi the depo shots , so far, but as you missed it the harmons have come down and show the symptoms.
As there was excess bleeding during previous periods due to the shot, anemia
would have developed, and caused the changes.
I advise you to consult a gynecologist for diagnosis and treatment.
Wishing for a good luck. Thank you.