What Causes Delay In Periods After Stopping Oral Contraceptive?

hi...i'm 40 yrs old.i've been taking oral contraceptive pills for 10 years,but since my hubby is inactive on sex,i decided to stop taking it after my last menstruation last may 21.i am lossing weight this time,for about 10 kilograms.....besides i was so much stress because of family problems.is it true that these maybe the result of my delayed menstruation?i am sure i"m not pregnant because we don't have contacts after my last menstruation stated above.i'm confused what to do,because until now,i dont still have my period...i think it's 15 days delayed as of now.please help me on what medecine to take.