Sukanya, you have received great advice from JKGrandma, Anna, and Skitch.  What you are doing is extremely dangerous and could end up leaving you with major health problems that could last your lifetime, or as was said above, death. Being thin is not everything.  Being happy and healthy is, and obsessing about your weight will not help you achieve anything but constant worry and grief.  IT'S NOT WORTH IT!  Please read all these posts over again and really give some thought to what might lie in store for you if you continue on the path you are on.  Please talk to your doctor or a counseler who can find out why you have these feelings and can help you deal with them.  Good luck to you