It seems likely that the problem you reported (irregular menstrual cycles and irregular menstrual period, since stopped taking birth control shot) might be related to a hormonal imbalance. This hormonal imbalance is highly likely related to use of birth control products.
Irregularitied in menstrual cycles and periods can be often seen in women after they start or stop taking birth control products. Even changing from one birth control product to another might cause a hormonal imbalance.
The hormonal imbalance after you stop taking the birth control product might last for a longer period of time. The time needed for the hormonal production to be restored completely differs in every woman, and might even be different in the same woman when changing a birth control regimen in different occasions. Usually several months are needed for a menstrual cycle to return, but it might take even longer.
You might want to visit a gynecologist for a physical examination and hormone laboratory tests. If a hormonal imbalance is detected, you might be advised to take hormone-containing pills to try to induce normal hormonal production and restore it to the previous normal level.
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