What Causes Light Period Inspite Of Being On Laxatives?

I first started taking laxatives to lose weight... but now I kind of want to stop because I saw how it affected my menstrual cycle and I thought, that can t be healthy . Mainly because it looked as if my body was struggling to have a period, but the laxatives were preventing it.( I knew something was wrong when I finally got my period, but the flow was incredibly light, as opposed to my normal heavy flow. )I ve tried to quit before, and saw that I was extremely constipated, so, what choice did I have but to go back on them? I need to know how to get my bowels back on track, and if my periods will return once I stop taking the laxatives.