Since you have never had a period in the past four years, these symptoms could possibly indicate the onset of a withdrawal bleed since return of ovulation usually does not happen so soon after stopping the depo shot. Yet, if you have been sexually active throughout this phase, you should see a specialist for a complete evaluation and also test for pregnancy
. Your symptoms can happen in very early pregnancy, too. Please stop smoking
and drinking, if you have the habit. Hope you find this information useful. Take care.