about two years ago I accidentally almost dried myself up by sucking lots and lots of sage cough drops for a couple of days. But I never had a very abundant supply in the first place. I assume this only "worked" because they were organic made of real sage not artificial sage flavour. There are other herbs which can be used look on the internet for "anti galactagogues" this is the scientific term for foods/herbs/meds which stop milk.
but honestly it sounds to me like you need a lacation counsellor or a doctor to be honest, to prescribe something so you can dry up. If you are unwiling to see a doctor (which I can relate too ;-) at least try an LC.