Start eating regular, wholesome and fiber rich meals, drink 8-10 glasses of water a day and start moving your body. If for some reason someone is preventing you from doing these things (especially not allowing you to eat), you need to seek help as that is called abuse.
Also-- using a laxative like you have in the pass Exlax will make your intestines lazy and continued use will make you dependant.
The problem with constipation is that the toxins and antigens in your stool will eventually be absorbed back in your intestines and cause all sorts of illnesses --
Constipation is alot more serious that alot of us think!!