From your information, it appears that actually the Depo shot is helping you. This is because, though I am not a gyn-obs expert, I can safely guess that by the time you were due your shot on the 21st of january, your blood levels were already low and since you did not take the shot at its normal time the changed blood levels are causing you problems. In psychiatry, we call this kind of reaction withdrawal syndrome. I don't know if that is typical of Depo-Shot. If it is this the problem, then we usually taper our medicines and not stop them suddenly....so my guess is that you depo shot could also be done in the same way. But as I say, I am not OBG expert so you might be better of posting this question in the relevant community here on health care magic.com so that experts can answer you.
If your symptoms persist even after the hormonal
levels have been stabilised then only think of a psychiatric consult.