I understand your concerns. With four injections of Aldol-Decanoas, the concentration in your body should be low after 13 months. Although the half-life of the drug is long, it does not necessarily mean that the drug remains in significant concentration for the entire period.
For flupentixol decanoate, the half-life can be several weeks, but this does not mean that significant concentrations remain after 18 to 24 months. If the medicine is taken over a longer period of time or in higher doses, there may be longer effects. Xeplon, with a longer half-life, could actually stay in the system longer.
Each person reacts differently, and residual effects may vary. For advice specific to your situation, it would be ideal to consult a doctor, who can perform tests or evaluations to better understand what is happening in your body.